I love "cast on target's target" as a general grouping tool.
With it, I can be ultra-lazy dps or healer (my 2 main roles), target the tank and cast attacks. Normally I keep the tank targetted and never hit anything he's not already hitting.
However, I also like to use macros. I set up macros for similar skills that are on cooldowns.
This casts Sovereignty when it's off cooldown, and lets me spam waterjet while waiting for it to come back. I use similar macros on my rogue, so that reactives and special attacks are used as soon as they come up.
The problem is if I have the tank targetted and hit my macro, it switches my target OFF of the tank onto the target. So then I have to keep retargetting the tank, which is a bother, and NOT the way it works when I just press the individual hotkey for cast waterjet.
Is this a bug, is there a way to make it work correctly, or what?