Here is my varmin huntin' strategy:

- I've managed to compile and install xfree86 in debug build. I think.
See cygcheck attached. See http://sources.redhat.com/ml/cygwin-xfree/2004-01/msg00160.html
- I modified startxwin.bat to launch XWin via:

gdb --args XWin -multiwindow -multiplemonitors -clipboard

- Continue working normally and wait for the trap catch something

Øyvind