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This problem popped up for me (or didn't pop up, depending on how you look at it) back when my guild at the time started working on Magmaw. I'd hop up on the worm's back, and half the time my bar wouldn't switch properly. I ended up downloading Bartender and enabling the Blizzard UI through that. After I did this I had no further issues on Magmaw, and the UI shows up properly when I get transformed for Un'sok.
Here are some basic instructions that I found with a quick Google search. Hope this helps.
Try turning off all your addons for the encounter, as certain addons conflict with the basic stuff you need to be able to get through a fight. Had one girl back in cata, not able to press heroic will back in dragon soul because of the way her addons were conflicting with everything.
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