I've been getting this sort of error sequence associated with "frozen" (no response to keyboard or close button) xgterm windows in X11 2.3.1. It's possible you've already fixed it, but I thought I'd bring it to your attention. Xlib: sequence lost (0x166a0 > 0xa7) in reply type 0x0! xgterm: warning, error event received: X Error of failed request: 0 Major opcode of failed request: 32 (X_UngrabKeyboard) Serial number of failed request: 26272 Current serial number in output stream: 167 xgterm: warning, error event received: X Error of failed request: 32 Major opcode of failed request: 1 (X_CreateWindow) Serial number of failed request: 52480 Current serial number in output stream: 167 xgterm: warning, error event received: X Error of failed request: 0 Major opcode of failed request: 1 (X_CreateWindow) Serial number of failed request: 52480 Current serial number in output stream: 167 Xlib: sequence lost (0x1bf00 > 0xa7) in reply type 0x0! xgterm: warning, error event received: X Error of failed request: 0 Major opcode of failed request: 0 () Serial number of failed request: 48896 Current serial number in output stream: 167 xgterm: warning, error event received: -G. -- Glenn Eychaner (geychaner@lco.cl) Telescope Systems Programmer, Las Campanas Observatory