Done. Thank you for your support so far.
I've found 2 bug reports for gimp which seem to be a duplicate of this bug:
https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/1023818 (pretty sure on this one)
https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/1021885 (similiar description, but no xorglog)
Maybe somebody can have a look at them to make sure.
Done.
Thank you for your support so far.
I've found 2 bug reports for gimp which seem to be a duplicate of this bug:
https:/ /bugs.launchpad .net/ubuntu/ +source/ gimp/+bug/ 1023818 (pretty sure on this one)
https:/ /bugs.launchpad .net/ubuntu/ +source/ gimp/+bug/ 1021885 (similiar description, but no xorglog)
Maybe somebody can have a look at them to make sure.