OK, if I didn't know any better, I'd swear I was being punked.  My system option "dynamic highlight from graphics view" keeps turning itself off.  I will be in the middle of working, go to select an edge, and it will not highlight.  I go back into the system options and toggle it back on under "Display/Selection" and everything will be working fine again.  I  will be working uninterrupted, and again it will turn itself off.  This occurs 3 to 4 times a day at random intervals.  Has anyone else ever encountered this issue?  This is getting to be annoying.  Any feedback is greatly appreciated!