x-server crashes on logon

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ProblemType: Crash
Architecture: amd64
Date: Tue Apr 22 22:13:02 2008
Disassembly: 0x2b791b8a8875:
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/serpentine
InterpreterPath: /usr/bin/python2.5
NonfreeKernelModules: nvidia ath_hal
Package: serpentine 0.9-5ubuntu2
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/serpentine -o
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: serpentine
Stacktrace: #0 0x00002b791b8a8875 in ?? ()
StacktraceTop: ?? ()
ThreadStacktrace:
 .
 Thread 1 (process 17772):
 #0 0x00002b791b8a8875 in ?? ()
Title: serpentine crashed with SIGSEGV
Uname: Linux 2.6.22-14-generic x86_64
UserGroups: adm admin audio cdrom dialout dip floppy lpadmin netdev plugdev powerdev scanner video