I was caught out by the following small bug recently. As in just about every application I can think of which supports multiple windows, the keyboard shortcut Ctrl+F6 in MEP 2013 switches to the next movie if several are in use. But it fails to switch the highlight to the correct tab. So at a glance you can easily think you're in Movie A but you're actually in Movie B.
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Terry, East Grinstead, UK