The other issue I ran into today (that subsequently killed my tank and half the party) is that if a mouseover target is out of range, AND you don't have someone actually targeted, you will heal yourself. This is really bad if, say, you're facing your tank, and you THINK you're in range. Turned out he was just OUT of my range. Yet, I mouse over him, click the button, see a cast bar. Cool! .... until I see the cure effect me as my tank dies. Hrmmmmm. Eventually went back to just <mo>. Now, as a healer (I use the <mo>, <tt>, <me> macro on my pally) I'm pretty much exclusively staring at health bars, mouseover alone is pretty much all I need.