Hi Cees, you may have run into the "non-debuggerable" situation I asked about a
while back..

 
http://lists.squeakfoundation.org/pipermail/squeak-dev/2005-January/087592.html

Unfortunately, I did not know how to fix it, sorry.

 - Chris

> Funny - I had the image running with the process browser open. Tonight
> the thing hung again, I could Alt-. but although the debugger window
> popped up, input wasn't accepted. Furthermore, the process browser was
> full with suspended processes - I couldn't see any context because I
> couldn't select a process, so I killed the image for another try...
> 
> If anyone can shed a light on this, it'd be much appreciated :)