First of all -
http://www.mmowned.com/forums/wow-ex...holy-nova.html talks about the bug, and how he figured out a way to replica it "sort-of".
Second of all -
[ame=http://www.youtube.com/watch?v=ROf3aAwPyLU]YouTube - Unlimited Mana World of Warcraft[/ame]
Shows a video of someone with the bug.
The purpose of this post is to show that it happened to me - and I know exactly how it did. Will it happen again if I mimic the exact same situation? Not sure.
We were doing a badge run in Kara, and at Aran I ran in to avoid blizzard. I started casting mindflay (oops forgot about silence) and sure enough - got silenced. I started spamming innerfocus while in melee range to apply it as soon as the silence wore off - and it worked. I ran out of melee, started casting, and realized inner focus was stuck on me.
Here are some screenshots of when I first realized it was stuck, and a few more throughout the run (still have it on)
Enjoy.