Have you tried applying Mike Alexander's patch yet? It fixed it for me.
http://list-archive.xemacs.org/xemacs-nt/200006/msg00024.html
a.. Subject: Re: Mingw crash
b.. From: Mike Alexander <mta(a)arbortext.com>
c.. Date: Thu, 8 Jun 2000 14:52:11 -0400
d.. Cc: XEmacs Patches List <xemacs-patches(a)xemacs.org>
e.. In-Reply-To: <zoozhzjj.fsf(a)ecf.teradyne.com>
f.. Message-Id: <p04320404b5659b4c0d17(a)[148.59.233.133]>
g.. References:
<002101bfcf95$10e17130$a5061bac@inneh3><zoozhzjj.fsf(a)ecf.teradyne.com>
>>>>> "APA" == Adrian Aichner
<Adrian.Aichner(a)t-online.de> writes:
APA> That bug is still around in
APA> r21-4-5-rc1
The assertion actually moved by 3 lines.
Here is the exact error message:
Fatal error: assertion failed, file
c:\Hacking\xemacs\xemacs-21.4\nt\..\src\event-msw.c, line 1518, (!badly_p
&&
active == WAIT_TIMEOUT) || (active >= WAIT_OBJECT_0 && active <=
WAIT_OBJECT_0 + mswindows_waitable_count)
APA> Can't say much of the circumstances other than I was using XEmacs
APA> "normally" with gnus started up too.
APA> I think I was trying to start a compilation with
APA> M-x compile RET make all RET
APA> --
APA> Adrian Aichner
APA> mailto:adrian@xemacs.org
APA>
http://www.xemacs.org/
--
Adrian Aichner
mailto:adrian@xemacs.org
http://www.xemacs.org/