21.5.28: Cannot activate ecb

[Ville Skyttä]

Originally reported as https://bugzilla.redhat.com/302371 :

"M-x ecb-activate" appears to send XEmacs 21.5.28 into an infinite loop or 
something.

I see either this in the minibuffer (can't make out the rest and XEmacs is 
stuck at this point with 100% CPU usage so that all I can do is kill it):

   Warning: error in 'post-gc-hook': attempt to throw outside of function:
   To catch `((#<INTERNAL OBJECT (XEmacs bug?) (symbol-value-forward type 13)
   0x85b670> (error (ecb-layout-debug-error advice of current-window-configur

...or this, ditto in the minibuffer:

   Warning: Error in `pre-gc-hook': (stack-overflow (Lisp nesting exceeds
   `max-lisp-eval-depth'))

A dump of what I see at the console when killing XEmacs stuck this way is 
attached (gzipped).  Anyone else see this and/or have ideas what could be the 
problem?
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