This problem is a known problem. A mouseclick over a unitframe is intercepted by the WoW client. It's not treated like you would expect. You *must* use a keyboard keypress to activate an ability on mouseover on a unitframe.
To test what I mean, move your mouseover macro to button 1 of your main hotbar.
Move your mouse over someone in the 3D world.
Press the 1 button on the keyboard.
It will fire.
Now, move it over a target unitframe and press button 1.
It will fire.
Put it back as a mouseclick keybind.
Hover over someone in the 3D world and do the mouseclick.
It will fire.
Now put it over a target unitframe and do the mouseclick.
It will fail.
The only way to trigger a spellcast on click over a unitframe is to use an addon such as Healbot, VuDu, or Clique. (My preference is with Clique)
I hope this helps your understanding.
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"imo Fara raged and gave Joker his scars" - Blueninja of Shadowmoon
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