I think I found a bug in P7 - if you are rendering an animation and you disconnect the mouse (unplug from usb) - poser eventually crashes.  My monitor has a built in hub.  SO I start the rendering at night and turn off the monitor - which turns off the hub - which turns off the mouse.  Next morning - poser has disappeared.  All I see is my desktop.

Repro's 100%

just fyi