Almost every time I try to use VATS the screen will freeze. If I move the mouse I can hear the sound and I can still select targets or exit VATS. When I exit I can hear the sounds of combat and I'll eventually die but the screen remains frozen to just before I entered VATS even after auto loading my last save. It's gotten to the point where I can't even use VATS at all.
The same issue occurs sometimes when I am hard saving but it's not as big of a deal then as I can just close out and load the save I just made without a problem.
I don't know if this issue is related to the NPC slowdown/stutter issues. I intend to try the d3d9.dll fix when I get home but I wanted to see if anyone else has experienced a similar issue.