Here's the backtrace of trying to do the same tulip action within an xnest environment.
Program received signal SIGSEGV, Segmentation fault. 0x08157738 in _mesa_shareContext () (gdb) bt #0 0x08157738 in _mesa_shareContext () #1 0x0810995a in GlxInitVisuals () #2 0x081089c4 in GlxInitVisuals () #3 0x080d495c in GlxInitVisuals () #4 0x080d4b09 in GlxInitVisuals () #5 0x080d091a in XETrapDispatch () #6 0x08072aeb in dixDestroyPixmap () #7 0x080847d9 in NotImplemented () #8 0xa7c4eea8 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6 #9 0x0805c781 in ?? () -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]