My OQ says that my battletag is missing or invalid. When I do /oq stats, it says my battletag can not be found. However, on my friends list, it list my battletag and that I'm connected to b.net. OQstats also says I'm connected to us.logon.worldofwarcraft.com. I had this issue after switching between my main and my alt. The issue only occurs when I try to use my main toon.

try typing:

/oq harddrop
/reload

let me know if that helps

Woohoo, it works. Thank you. 

That does not work for me. Is there anything else i can do?