Oh from
http://forums.worldofwarcraft.com/th...p=1#post270816
* NEW - isShown = FontString:IsShown() - Return whether font string is shown (NOTE: FontString IsVisible behaves properly now on hidden tooltips, tooltip scanners need to use IsShown instead !)
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Take out the SetOwner and try using IsShown instead of IsVisible.
I think that's the more correct fix than setting owner (which has a SetPoint and stuff involved which can make the process take longer)