Quote Originally Posted by Rongway View Post
The three places you should mouseover are the party list, the focus target, and, for out-of-party tanks, the targetoftarget. These panels are all stationary and on top of the world, so there is no risk of someone moving and changing your mouseover, unless the targetoftarget changes (but presumably that person had his own healer and you were just helping out). If there's a mismouseover, it'll be because you had your mouse over the wrong person in the party list, which is something within your own control.
Mouseover macros work if you mouse your cursor over top of the actual player as well.