Hi there I'm currently on CVP 11.6 and I too am getting the exact same issue.  I cannot for the life of me find where that class file is for the LeaveQueue.  However, I can do all the steps up above and we aren't using any certs in my environment for...

The closest I've ever gotten was just to make the title bar empty and then the height of the gadget to nothing in finesse.  It turns out like this...