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https://bugzilla.redhat.com/show_bug.cgi?id=471927
--- Comment #16 from Matthias Clasen mclasen@redhat.com 2008-12-15 00:32:13 EDT --- Created an attachment (id=326904) --> (https://bugzilla.redhat.com/attachment.cgi?id=326904) try to unset _NET_SUPPORTING_WM_CHECK
Does this metacity patch make things work for you ?
Note that this is only a best-effort patch, it will only help if metacity is shut down gracefully. If it is simply killed, it still leaves _NET_SUPPORTING_WM_CHECK behind.