I also had this problem when I first bought Poser Pro... shadows remaining and the crashing problem with dual monitors.

Sounds like we have similar setups... Vista 64, dual monitors etc.

I guess I was lucky in that a video driver update (Nvidia) solved the problem for me, but... it wasn't the latest drivers... they didn't solve the problem. It was an earlier driver... specific for GT X280 1GB (SLI).

But annoyed that NVidia dropped the facility for switching programs, etc., between monitors. I have to manually drag things over to my second monitor. However... once Poser was set-up for both screens and saved in preferences, it starts up on both monitors.

Doesn't exactly help you, but... indicates that the problem wasn't specific to you... seems to be a common video driver related problem.

Edited:  Dam it..! Just fired up Poser to make sure and... the shadows DO stick when moving panels around, etc. I hadn't noticed them before, because I don't move them about very often.

However... it only seems to happen when moving panels across to the second monitor. If they are moved about on the main monitor, I don't get the shadow. They don't occur all the time and when they do, the disappear after a few seconds.

Guess it must be a Poser quirk when using dual monitors.

"You don't have to be mad to use Poser... but it helps"