qgis - Issues with datasets when custom SLD loaded into geoserver

I have created my SLD's in QGIS and want to use them in Geoserver. I have imported and validated them without any problems

but when I try to view the data using Layer Preview --> OpenLayers-->Go it tries to download the data rather than let me view it. With the default symbology it works fine.

Is there something fundamental that I have to change in the SLD from Geoserver for it to work?

One of the simple and 2 complex SLD's are below (roads at different zoom levels)

Roads - Simple

    
    
  
    Roads_GHD_20121121
    
      Roads_GHD_20121121
      
        
          GHD Roads
          250000

          
            
              #ff0000
              0.4
              bevel
              square
              5 2
            
          
        

      
    
  

Roads - Complex

                       xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd"
                       xmlns="http://www.opengis.net/sld"
                       xmlns:ogc="http://www.opengis.net/ogc"

                       xmlns:xlink="http://www.w3.org/1999/xlink"
                       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    
        Road with border
        
            

            
            
                

                    
                        
                            State_cont
                            Y
                        
                    
                    0
                    1787
                    
                        

                            #CDAA66
                            12
                            round
                        
                    
                
            
            
                
                    

                        
                            State_cont
                            Y
                        
                    
                    0
                    1787
                    
                        
                            #FFFFFF

                            11
                            round
                        
                    
                    
                        
                            road_name2
                        
                        
                            Arial

                            10
                            normal
                        
                        
                            
                        
                        
                            
                                1
                            

                            
                                
                                    #FFFFFF
                                
                                
                                    1
                                
                            
                        
                        

                            #000000
                        
                        true
                        30
                        800
                        1000
                    
                
            


            
            
                
                    
                        
                            State_cont
                            Y
                        
                    
                    1787

                    3573
                    
                        
                            #CDAA66
                            7
                            round
                        
                    
                
            

            
                
                    
                        
                            State_cont
                            Y
                        
                    
                    1787
                    3573

                    
                        
                            #FFFFFF
                            6
                            round
                        
                    
                    
                        
                            road_name2

                        
                        
                            Arial
                            10
                            normal
                        
                        
                            
                        
                        

                            
                                1
                            
                            
                                
                                    #FFFFFF
                                
                                
                                    1
                                

                            
                                                
                        
                            #000000
                        
                        true
                        30
                        800
                        1000
                    

                
            

            
            
                
                    
                        
                            State_cont
                            Y

                        
                    
                    3573
                    28573
                    
                        
                            #CDAA66
                            4
                            round
                        

                    
                
            
            
                
                    

Points Complex with SVG files.

                        
                            State_cont

                            Y
                        
                    
                    3573
                    28573
                    
                        
                            #FFFFFF
                            3
                            round

                        
                    
                    
                        
                            road_name2
                        
                        
                            Arial
                            10
                            normal

                        
                        
                            
                        
                        
                            
                                1
                            
                            
                                

                                    #FFFFFF
                                
                                
                                    1
                                
                            
                        
                        
                            #000000
                        

                        true
                        30
                        800
                        1000
                    
                
            

            
            

                
                    
                        
                            State_cont
                            Y
                        
                    
                    28573
                    114287
                    

                        
                            #D7C29E
                            1
                        
                    
                
            

            
            

                
                    
                        
                            State_cont
                            state
                        
                    
                    0
                    1787
                    

                        
                            #CDAA66
                            13
                            round
                        
                    
                
            
            
                

                    
                        
                            State_cont
                            state
                        
                    
                    0
                    1787
                    
                        

                            #FFFF00
                            12
                            round
                        
                    
                    
                        
                            road_name2
                        
                        

                            Arial
                            10
                            normal
                        
                        
                            
                        
                        
                            
                                1

                            
                            
                                
                                    #FFFF00
                                
                                
                                    1
                                
                            
                        

                        
                            #000000
                        
                        true
                        30
                        800
                        1000
                    
                
            


            
            
                
                    
                        
                            State_cont
                            state
                        
                    

                    1787
                    3573
                    
                        
                            #CDAA66
                            7
                            round
                        
                    
                

            
            
                
                    
                        
                            State_cont
                            state
                        
                    
                    1787

                    3573
                    
                        
                            #FFFF00
                            6
                            round
                        
                    
                    
                        

                            road_name2
                        
                        
                            Arial
                            10
                            normal
                        
                        
                            
                        

                        
                            
                                1
                            
                            
                                
                                    #FFFF00
                                
                                
                                    1

                                
                            
                        
                        
                            #000000
                                                
                        true
                        30
                        800
                        1000

                    
                
            

            
            
                
                    
                        
                            State_cont

                            state
                        
                    
                    3573
                    
                        
                            #CDAA66
                            5
                            round
                        

                    
                
            
            
                
                    
                        
                            State_cont
                            state
                        

                    
                    3573
                    
                        
                            #FFFF00
                            4
                            round
                        
                    
                    

                        
                            road_name2
                        
                        
                            Arial
                            10
                            normal
                        
                        
                            

                        
                        
                            
                                1
                            
                            
                                
                                    #FFFF00
                                
                                

                                    1
                                
                            
                        
                        
                            #000000
                                                
                        true
                        30
                        800

                        1000
                    
                
            
        
    

Answer

QGIS produces SLD 1.1 while Geoserver only seems to support SLD 1.0 currently. The Geoserver blog indicates that they are working on it though, e.g. http://blog.geoserver.org/2013/02/26/geoserver-2-3-rc1-released/