Same problem here. With xfce4, if I move to gnome session it works OK.
but it used to work in xfce4 OK, probably not gimp bug..
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https://bugs.launchpad.net/bugs/473172
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/35046616/Dependencies.txt
** Attachment added: XsessionErrors.txt
http://launchpadlibrarian.net/35046617/XsessionErrors.txt
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gimp selection not working under nvidia
https://bugs.launchpad.net/bugs/473172
You received
often overlooked things that may cause an issue
** Changed in: gimp (Ubuntu)
Status: New = Invalid
** Converted to question:
https://answers.edge.launchpad.net/ubuntu/+source/gimp/+question/88421
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gimp selection not working under nvidia
https://bugs.launchpad.net/bugs/473172
You