I have used OQ for some time now, even done some changes in the "oqueue.xml" document to change sizes etc. But I was grabbing the window once to move it, and I then recived a "spike" (short freeze lag). When I retrived the conection my OQ window was gone. 
I can press the button for OQ on mimiap and still hear an effect for the window opening. But nothing comes up. 
I tried to reinstall OQ and another version. Deleted WTF folder and clearing saved variables. But it still wont show up. Kind of frustrating since I'm on a low populated server and want to do my fun.

Anyway, if anyone has any ideas it would be highly appreciated! 

/Cheers! 

give this a try:

/oq fixui

Thank you so much!