I found this one yesterday. The bug description went something like this: "Start app. Press a key. App crashes."

D'oh! This one was caused by some weird interactions between our keyboard shortcut handler and our new localization code. Apparently some strings that weren't supposed to be localized were, which broke some of our accelerator actions. But hey, it's early in the product development cycle. Things are allowed to break.

(And no, this bug wasn't my fault!)