Unable to Sell

[Cerulean2013]

Does anyone know of any add-on that is causing trouble with not allowing you to sell items at a merchant?

I have been turning off the different ones I have but I can not locate the problem. What is happening, when I open a merchant screen I am able to purchase items but when I try to hit the sell tab it doesnt work. The only way I can sell is to make anything I want sold as junk.

Been checking out other forums but found nothing yet.