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Notice the black box around the content area. It should look like the following:

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I'm not sure what I pressed to get this, but it just started showing up and I'm not sure what's causing it. It shows up in every application.

Any ideas on how to disable it or what might be causing it?

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up vote 3 down vote accepted

Ah! Found the answer:

It's to do with voice over, which I guess is triggered on my machine by pressing ⌘F5

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It happens to plenty of people, don't feel bad. :p – stalepretzel Aug 8 '09 at 17:30

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