I got this after running XEmacs for couple of days. xemacs-21.4.1: Fatal I/O Error 0 (Error 0) on display connection ":0.0" after 1861692 requests (1861691 known processed) with 4 events remaining. (gdb) where #0 0xfed18228 in _poll () from /usr/lib/libc.so.1 #1 0xfeccb808 in select () from /usr/lib/libc.so.1 #2 0xfefbb5c4 in _XtWaitForSomething () from /usr/openwin/lib/libXt.so.4 #3 0xfefc0798 in XtAppPending () from /usr/openwin/lib/libXt.so.4 #4 0x17bb24 in drain_X_queue () #5 0x17bc50 in emacs_Xt_event_pending_p () #6 0xb95a0 in event_stream_event_pending_p () #7 0xba1bc in detect_input_pending () #8 0xbb7a4 in run_pre_idle_hook () #9 0xbbb74 in Fnext_event () #10 0x6bf7c in Fcommand_loop_1 () #11 0x895dc in condition_case_1 () #12 0x6b894 in command_loop_3 () #13 0x6b8c8 in command_loop_2 () #14 0x8923c in internal_catch () #15 0x6bac0 in initial_command_loop () #16 0x855f0 in xemacs_21_4_1_sparc_sun_solaris2_7 () #17 0x85e7c in main () Tony