I've just installed Avast! Internet Security, after that Poser 8 has started behaving very odd. If I uninstall Avast!, it works normally again. Reinstalling it  causes the problems to reappear. 

For example, I load a figure, and it appears to load (Poser says "Loading"), and the figure name shows up on top of the Preview window.  But the figure itself just doesn't show up - the  Preview windows remains empty. I can even render the figure, and Poser does all that it normally does when rendering, but the Render windows also remains empty.
 
If I choose File>New, the Preview window goes black, and so does the light controls. I can get the light back in the light controls manually, but the Preview window remains black.  

I've tried to disable all the Avast shields and the firewall completely, but the problem remains the same.

Have anyone else experienced this?