Being away from the game for a while. I re-loaded it on a new PC and was half way into the game when weird things stared happening. Instead of an enemy I would get a big red blob with a ! in the middle of it. No way to hit them even in vats. Sometimes grenades would do it. When I got further in the wasteland I came across INVISIBLE Albino Scorpions. These are the worst on their own without being invisible. Totaly screwed up my game. Then I remebered to up the patch to 1.7, so far so good.
Just a FYI

No idea what caused that. All I know is I'd have loved to have seen a video of the big red blobs