I ran into some issues healing post patch and I was hoping someone might be able to shed some light. At some point when my tank would engage the mobs my keys would go dead and i couldn't cast anything.

My healing workflow:
i have my 3 heals (flash, down ranked holy, and max holy) on my action bar 2-4.
when tank goes into engage, I hit 2 and wait to see the mob toe to toe and then click on his portrait.
I do not have usually have the tank selected as a target in a five man. Sometimes i'll have a mob targeted so I don't accidentally start a heal on a toon that i didn't mean to or accidentally auto target a mob marked for CC that gets loose and hits me.

... so heal goes off, i hit 2 again and click on the portrait I want to heal easy as pie. Or so it was before the patch.

Issue:
I would try to hit 2 for my heal then click on the toon and nothing would happen. I would hit escape to release my target and escape would do nothing. I would cycle through my function keys but still i couldn't cast a spell. This seemed to happen whether or not I had a mob targeted to start or not. It also didn't happen on every pull.

even after the wipe and i Soul Stoned, i couldn't rez or heal anybody..

at some point... i would regain control and all my heals would go off as if nothing was wrong

My macros:
I use the below macros to help me make use of my trinkets and abilities on longer cooldowns that i always forget to blow in long fights.

/use xi'ri's gift
/use lowercity prayerbook
/cast divine favor
/cast divine illumination
/stopcasting
/cast <heal>

none of the casts trigger global cooldown except the last heal.
I have the /stopcasting in there because the macro seemed to hang after the /cast divine illumination.
I took it out and it looked like it was working for a bit... but then wham, right after a pull i can't heal.

the freaky part is, i can't even hit the escape key to get to the interface menu...

This is how i've always healed and those macros seemed to work fine before the patch. Can anybody tell me what's going on?
I renamed my WTF folder and disabled all my add ons...
(not as if i wasn't gimped already in magister's terrace already....)

rebooted blah blah...

Thanks for the report, our UI specialist was able to use your macro to reproduce the issue and it is being worked on.