This doesn't seem like X-PERL and on my moonkin I never had to deal with this bar.
I don't use Bartender, but it would be weird if it caused that bar as well.
Are you only using those two addons?
Edit: Here's a link i.imgur.com/MjEZ16D.jpg
Type into your chat /fstack and press enter.
Hovering over any item on the screen will display a tooltip in one of the corners giving the names of any frames located under the mouse pointer.
Use that to try and see if its naming offers any hints as to its source.
Typing /fstack again will remove that tooltip.
If you are unsure, then reply here with what you see listed, and if possible a full list of your enabled addons.
Last edited by ComputerNerd; 2013-10-04 at 10:25 PM.
my bet is on NeedToKnow
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It looks like ForteXorcist with a different bar skin, though FX doesn't give a duration on my eclipses (because technically the duration is determined by how much you cast your way out of it).
Jamba does the same thing, I've just multi-boxed and RAFed my druids for speedy levelling and had this.
If you have that addon installed, open the Jamba configuration (/jamba) > Combat > Proc and you can either turn off the procs completely or remove certain procs. I just turned them off completely as I could see when the other druid had procs without it.