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Similar problem here. I have an email in to Markins but appreciate your thoughts, Pete.
Have had my Q3T for 3 days using on a monopod. Day one ball got stuck and I realized what happened and loosened the friction control dial with a dime and got things working well. Today, however, the knob got stuck as described in this thread. The ball is loose but the locking knob is stuck. I've tried tightening it and loosening it and neither seems to works. I'm at the point where I think I'll tear the rubber. The Markins info says to use"an impulsive force" which I presume means tapping or striking rather than just twisting, but I can't figure out how tom do this.
So in summary: the ball is loose, the ball locking knob is stuck, and the friction control dial can be tightened or loosened with ease.