PFF disabled on my Dom
We haven't heard whether it was on purpose or a side-effect of messing with Mace Mastery on Controllers. There was another post in Tech about it but it turned into a flamewar of someone's remark before there was any strong input so it's not even worth finding and linking lol.

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I think it was an unintentional oversight.
FYI: Mine's broke on my Dom as well and I sure could have used it when the tip mission ambush spawned on my head yesterday.
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In Today's Patch Notes (10/05)
CITY OF VILLAINS
Dominators
Mace Mastery - fixed availability of Personal Force Field; the power was not unlocking properly
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From the 9/28 Patch notes:
Controllers
Mace Mastery/Personal Force Field - This power has been replaced with Focused Accuracy.
On my Ice/Icy Dom, the PFF is disabled. So was it unintenionally removed from Doms, also. Or did they just not update the notes to include Doms. This really puts a damper on my build if so.
@Blood Beret(2)Twitter
I am a bad speeler, use poorer grammar, and am a frequent typoist.
MA ArcID: 1197
You have enemies? Good. That means you've stood up for something, sometime in your life. Winston Churchill