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When you don't have a focused window in your window set (or the bug isn't happening to you) you should get a window that shows the item mentioned in the growl notification, even if it has to change the view bar to show completed items.

I've also noticed (and reported) that links to items in the Inbox do not work properly, and that means that a growl notification for an item in the Inbox will not work properly. It's a bit puzzling that they didn't get this right, because the link includes the internal object identifier for the item from the XML file and it would thus seem to be straightforward to find it using the same code that is used for everything else under the sun...