Hey Hex - figured I'd ask here since this isn't an emergency really instead of over on the nexus, looks like you are dealing with enough there.
Disappearing enemies - Started new game just to check stuff out. Rats that come through the wall in the prison are invisible to me.
Loaded up an older game - ran into one of MMM's lesser hill giants and could see it fine. Until it moved behind a tree, when it came out from behind to wack me, it was invidible. Except for this very huge axe. Was kind of like the "attack of the ax!"
I have UV appear at the very end of my LO just above the bash patch.