Hi All, I have been getting this quite a few times now in 21.2-b38 on native NT, usually while working in ediff. I'll have to build a debug version again, unless somebody knows already what this is: Typed by hand: Fatal error: assertion failed, file d:\tmp\21.2\xemacs\nt\..\src\event-msw.c, line 1489, (!badly_p && active == WAIT_TIMEOUT) || (active >= WAIT_OBJECT_0 && active <= WAIT_OBJECT_0 + mswindows_waitable_count) Best regards, Adrian -- Adrian Aichner mailto:adrian＠xemacs.org http://www.xemacs.org/