Ive had the same problem, but just with no GPF or crash. The program just refuses to save. Sometimes it will, sometimes it won't. I use update 4.02. 4.03 and later was so buggy, I didn't want to try any others. I've found it generally won't save when I've imported Voluptuous Vickie as a Pz3. The reply I got from E-on was less than inspiring: (Paraphrase)- "We're confused. This has never happened before. Don't know what to tell you." I resolve this by doing a screen capture. Not the best, but it does work. MN