I don't know if it was a gdm problem. It might have been a kernel problem.
With a new kernel version, the problem was alleviated,
but still a problem remained with Seamonkey browser.
After selecting an URL an pressing ENTER would still log out.
With manual login, pressing ENTER first used to make
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/52303779/Dependencies.txt
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Pressing ENTER after automatic login logs out abruptly
https://bugs.launchpad.net/bugs/608577
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Public bug reported:
Binary package hint: gdm
After re-login manually, the problem is solved.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: gdm 2.30.2.is.2.30.0-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic i686
NonfreeKernelM