Processes, such as XPress/ Microsoft Word, etc, work in a sandbox and cannot cause a kernel panic. I have not seen one of those in years, and I do very evil things with XPress every day
If it is a kernel panic, then in my experience it is almost always a hardware issue.. connecting USB drives, loose RAM, etc.
However, if what you are seeing is a KERN_INVALID_ADDRESS crash, that is not a kernel panic at all, but a crash in process space. If that is the case, then you will have a log of that in ~/Library/Logs/CrashReporter/QuarkXPress which you can send to technical support.