The .Xsession-errors file looks to have helpful errors.
I believe the key might be the:
(<unknown>:2259): Gdk-WARNING **: XID collision, trouble ahead
errors. http://ubuntuforums.org/showthread.php?p=7506398 may be helpful.
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https://bugs.launchpad.net/bugs/728017
Title:
xwindows over ssh causes instability
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