[cluster@node0 ~]$ /usr/lib/xscreensaver/glsnake X error in glsnake:X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 144 (GLX) Minor opcode of failed request: 5 (X_GLXMakeCurrent) Serial number of failed request: 132 Current serial number in output stream: 132Locking assertion failure. Backtrace:#0 /usr/lib/libxcb-xlib.so.0 [0xb71b4767]#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0xb71b481e]#2 /usr/lib/libX11.so.6 [0xb7cfce08]#3 /usr/lib/libX11.so.6(XESetCloseDisplay+0x31) [0xb7ce05e1]#4 /usr/lib/libGL.so.1 [0xb7eeb4d5]#5 /lib/libc.so.6(exit+0xd4) [0xb7b69d44]#6 /usr/lib/xscreensaver/glsnake [0x804de38]#7 /usr/lib/libX11.so.6(_XError+0xd3) [0xb7cf6053]#8 /usr/lib/libX11.so.6(_XReply+0x231) [0xb7cfdbc1]#9 /usr/lib/libGL.so.1 [0xb7eedd49]