The problems that you encounter when doing your daily work of planning can be divided into the following groups:
Errors of all four types happen from time to time. Cadplan 3.1 has an elaborate graphical user interface (its a bit like switching from DOS to Windows) which everybody likes (no one wants to switch back to 2.7), but this also slows the system down: overall startup time has doubled. There are more processes running at the same time, process management obviously becomes more complicated. There seem to be some places in the program which are more susceptible to crashes (freezing screen, program shutdown) than others, especially when the user clicks around impatiently. I have no exact statistics because there are too many different users, and interruptions are usually short - too short to log them in a logbook -but I would assume that a significant part of all errors is of the following type:
Of course I'm just joking, and somtimes the program also crashes when a physicist sits in front of the screen. But physicists will understand me: when you stand next to them, everything works fine.