Any one know what UI it is?

[Ritgun]

[IMG][/IMG]

Currently, I am using Echo UI [Great UI pack anyway-].

Few days a go I updated my addons by WowAceUpdater.
And after that when I group with someone that small windows always show up.

It’s not movable and has no option……
I tried to figure out but failed-! So, please- anyone know What UI it is?

For Make it Clear-

After I disable Smartdebuff, it's gone-!
Therefore, I am pretty sure that windwos is from sdb.......