Bug#427406: metacity: No more mouse/keyboard-input possible, after closing crashed application

[manphiz]

According to the partial backtrace provided by Claudius Hubig, in which 
the backtrace got lost when encountered libc6-i686 stuff, I've got a 
Deja Vu with a recent bug reported toward aptitude(#431054) reporting 
keyboard handling lost when lib6-i686 was installed under kernel 2.6.18, 
and the symptom mysteriously got away when testing kernel had been 
updated to 2.6.21. I hope the same situation applies here too.