for my part this bug was remedied by using the workaround described in
https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/758609
using gconf-editor and unchecking the key "/apps/metacity/general/capture_before_unmap" after logging off and on again.
for my part this bug was remedied by using the workaround described in
https:/ /bugs.launchpad .net/ubuntu/ +source/ fglrx-installer /+bug/758609
using gconf-editor and unchecking the key "/apps/ metacity/ general/ capture_ before_ unmap" after logging off and on again.