Hi wavard,
Just a few more questions for you to clarify. progeCAD 9.0.18.20 has just been released (for progeCAD Professional). Is this the version that you are using?
What kind of OS/hardware are you running on?
What does the crash screen say? Does it offer any details about what went wrong? A screen shot might be nice...
Try the usual steps first, AUDIT and PURGE the drawing for any errors. Is the crash limited to a few certain types of drawings or anything you create even from scratch (blank drawing)?