Lars Magne Ingebrigtsen <larsi@gnus.org> writes in ding@gnus.org:

> SL Baur <steve@xemacs.org> writes:
>> And, of course, XEmacs 19.16 failed the same way XEmacs 21.0 and Emacs 
>> 20.2 do.
>> 
>> (gnus-group-set-info '("gnu.misc.discuss" 3 ((1 . 2872) (2874 . 2885))))
>> (gnus-group-set-info '("gnu.misc.discuss" 3 ((1 . 2872) (2874 . 2885))))
>> (gnus-group-set-info '("gnu.misc.discuss" 3 ((1 . 2474))))

> Hm...  Does this group have a cache, by any chance?

No.  I will never use caches again after the server renumbering fiasco.

> Anyway, could you debug-on-entry `gnus-dribble-enter' and send me the
> three backtraces produced?

I'm going to try an unbytecompiled version next and email it to you
off-list.