Ubuntu 12.10 automatic logout

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http://askubuntu.com – I just had a new desktop constructed and installed ubuntu 12.10 which was successful for the most part but every time I open up some applications like thunderbird I get automatically logged out and all my windows are closed. System error messages also come up from time to time. Also I'm not sure if this helps but if I select the "Use system title bar and borders" in chromium I will also get logged out and from that point won't be able to use it without getting logged out in the future. If anyone has any tips on how I can isolate and fix the problem I would greatly appreciate it. (HowTos)