[ubuntu] Transparent top bar when scrolling soundlevel

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http://ubuntuforums.org – Today i updated for the first time in months and all seems well except for the topbar that turns transparent every time i scroll over the sound indicator to lower or turn up the volume. It stays transparent as long as the osdnotify message is showing and turns normal again when it goes away. Any ideas on how i can fix this? I am using Ubuntu 12.04LTS with Unity on a laptop with an NVIDIA 8600M vcard. (Hardware)