xterm segfaults after a while.

Binary package hint: firefox-3.0

I just upgraded from Gutsy to Hardy Heron, and I noticed that xterm (/usr/bin/xterm) does not work after a while.

After booting the system, it works fine. I walk away, and when I come back (some hours later) the program segfaults. Im not sure how to save the core dumps- I tried to run ulimit -c 1024, but I can't find the core dump anywhere.

Xterm version:
 $ xterm -v
XTerm(229)

package name:
$ dpkg -S $(which xterm)
xterm: /usr/bin/xterm

Version of X:
$ X -version

This is a pre-release version of the X server from The X.Org Foundation.
It is not supported in any way.
Bugs may be filed in the bugzilla at http://bugs.freedesktop.org/.
Select the "xorg" product for bugs you find in this release.
Before reporting bugs in pre-release versions please check the
latest version in the X.Org Foundation git repository.
See http://wiki.x.org/wiki/GitPage for git access instructions.

X.Org X Server 1.4.0.90
Release Date: 5 September 2007
X Protocol Version 11, Revision 0
Build Operating System: Linux Ubuntu (xorg-server 2:1.4.1~git20080131-1ubuntu9)
Current Operating System: Linux edvin 2.6.24-16-generic #1 SMP Thu Apr 10 13:23:42 UTC 2008 i686
Build Date: 15 April 2008 05:26:17PM

        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Module Loader present

ProblemType: Bug
Architecture: i386
Date: Sat Apr 26 21:57:14 2008
DistroRelease: Ubuntu 8.04
NonfreeKernelModules: nvidia
Package: firefox-3.0 3.0~b5+nobinonly-0ubuntu3
PackageArchitecture: i386
ProcEnviron:
 PATH=/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox-3.0
Uname: Linux 2.6.24-16-generic i686