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seems like I remember a problem like this and the reason was not enough memory. Obviosuly if you have more than enoguh then its a differnt reason. If you can try it on another computer that would rule out a bad file. You may try re-installing impressions as well or give version 3 a shot.
Yikes, crashing on a system with 8gb ram here! Tried it on another with 12gb ram, same result. Trying version 3 now.
don't forget to check for service packs
http://usa.autodesk.com/adsk/servlet/ps/dl/index?siteID=123112&id=2334435&linkID=9364941#section2
Thank you so much, I had not seen the SP. FWIW working fine on version 3.