I also have many problems with the program. It doesn't crash but it lags after I use it for a little while and I can't seem to do anything else on the computer while it is running. I'm running 10.4.11 but the problems with the application seem to span 10.4 and 10.5. Do you see a the "Generating PDF" indication in the lower left hand corner of the application? That might be the problem which is a known bug and they are working on it.
