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Found out why. F5 is already tied to finishing words in OS X text apps. For instance if you type "supply" in OO4 and hit F5 it gives you a list of words beginning with "supply" that you could plug in.

Don't know how to turn this off, but it's easy enough to change OO4's shortcuts so you don't have to use function keys for hotkeys anyway.

Figured I would update this incase anyone else notices and were wondering.