Assist macro after Patch 3.3.5.12340

Does this macro still work? Somehow it doesn't work for me anymore after the minor bug fix patch (WoW-3.3.5.12213-to-3.3.5.12340-enUS-patch).

Code:

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/assist [target=Toon1,exists]

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So when Toon1 acquires a target, Toon2 will target that mob when the macro is called.

Edit: Solved. Lol. Toon's weren't partied...d'oh!

on the interface under combat there is an assist box this might help
try assist party 1 thats what i use