first try running without startup-sequence. look into your wbstartup folder, maybe you can disable some tools - create a wbstartup-off folder and copy items from
wbstartup to wbstartup-off - later you can copy them back.
can also be usefull. start it before you start scumm, after the crash you can still look to it's window. maybe you find something suspicious.
well, at least an answer after your second call