I'm a bit confused here. I was expecting QfG2 to show the same two-button dialog as the later SCI1 games (Memory fragmented [Who cares] [Debug]). The one in QfG2 actually has only one button, but it should still bring up the debugger as shown (from which the procedure in my first post was supposed to work). It also seems that, for QfG2 to check for fragmentation at all, it must be in the 'suck blue frog' mode? I wanted a snapshot as close to the crash as possible, so this would be preferable to opening the debugger manually, but if there's no other way...
Also, you did finish your playthrough, didn't you?