Oh God, my Misdirection macro is broken again...

[NiteFox]

So I'm back in the game for the first time since before the big 5.0 patch and trying to rebuild my character. This means selecting talents, selecting glyphs, and getting my UI back up to standard.

I had a Misdirection macro. No, I lie: I've had several Misdirection macros over the years, and for some reason Blizz keeps breaking them.

The basic flow of the macro is this:

1) if I have a focus target set (Usually the party/raid tank, occasionally that useless DPS who can't stop sucking or refuses to shut up), Misdirect to that target.
2) If my focus target is dead, Misdirect to my pet.
3) If I have no focus target, Misdirect to my pet.

My current, broken macro is:

Code:

#showtooltip
/focus [help]
/stopmacro [help]
/cast [@focus,exists] Misdirection;[@pet,exists] Misdirection

There were a few problems with this one that I was aware of, probably due to the last line. If the focus target is dead, then the macro would keep attempting to cast onto the focus; but aside from a few frantic moments this was something I could live with. Now the macro refuses to work at all.

So what's changed? How do I fix this? And why does alt-tabbing out of WoW cause major graphical screwups now?