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You did capitalize "Inbox", right? Perspective names are case-sensitive... I would check that you've still got an Inbox perspective, and that you're spelling it the same way in the perspective URL as it is in the Perspectives window.

I just created a completely new account with OmniFocus 1.8.2 and verified that clicking on omnifocus:///Perspective/Inbox created a new Inbox window, so it should be possible to get it working for you, too.