Inference Problem
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 I love Sketch-up - but that love is being undermined by an inference problem I have and don't seem to be get rid of. The problem is that inference points 'snap' to the back of a choice of elements. For instance, if i have two surface one in front of the other and i put the cursor over the top one I get the blue 'on face' inference mark. However if I left click on that point to, say, define one end of a line I find that it has picked the face of the surface behind. It didn't use to be this way. Have I toggled some option? And if so what? Any help would be most appreicated. Jon 
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 Hi Jon, I'm not sure it will help but try to check "Correct reverse picking driver bug" under Windows (Sketchup on Mac) > Preferences > OpenGL settings. 
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