Can someone who is experiencing (has experienced) this problem help nail down the exact version of MAME in which this began?
It appears that it might be specific to OS version, graphics card version, and video driver version, so it's very difficult to debug.
If we can nail down exactly what MAME change (possibly down to the 'u' update) started this, maybe we can find a fix that will allow people to use the latest Nvidia drivers again.