[plt-scheme] DrScheme hanging occasionally

Has anyone else experienced DrScheme hanging on WinXP occasionally? I'm 
getting a hang around once a day.

Anecdotally, it seems to be when I'm indenting, but that's far from 
repeatable or very specific obviously... It doesn't crash, and the Task 
Manager says that it's not busy (i.e. it's not garbage collection or 
something). Seems more like a deadlock of some sort.

Any suggestions on how to narrow it down? I have the .mdmp that WinXP 
generates, but that's probably not much use I guess.

scott