I installed ZA AV 9.1.603.000 and subsequently attempted to delete items from the quarantine. After all items are deleted, the Quarantine Status dialog "This dialog will close automatically when processing is finished. Please stand by..." won't close. I can't get rid of it by clicking the close button, the cancel button, or even by trying to end the ZoneAlarm process with Task Manager. I can only get rid of it by restarting Windows. (I'm running Vista 64 SP 2, almost fully updated, in 12 GB of memory, on an i7 920 running at 3.9 GHz.)
I was able to delete items from the quarantine prior to updating to 9.1.603.000 with out any problems.