I'm using QGIS 2.18.15 and have somehow ended up with the following on my screen. I've deselected every layer and these green X's and red lines persist. I cannot "undo" to remove them.
What are they & how do I get rid of them?
They may have originally been related to a duplicate node or something like that, but I have no idea what's going on.
Answer
You are in the middle of editing or creating a new line feature. If you toggle the layer visibility you still see the half-created feature, and if you toggle editing off in that layer you'll still see it!
If you re-activate the layer visibility of whichever layer it is, and re-enable editing, you might find you need to finish creating the element before saving the layer. Delete the feature if you don't need it.
The green crosses are self-intersections that show this is an invalid geometry - you should also have seen a warning like "Add feature: segments 0 and 2 of line 0 intersect at -2.35695756492, 0.44230006192 Geometry has 1 errors. Validation finished"
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