I have some very little problem with totalmix and ufx. I use two different sets of monitors, main being A, and the other being assigned to B. Sometimes (not everyday) if I activate the B, it gives sound only for a second, than there is no sound (meters are there).
The solution is easy. I have to reassign output B, and than the problem dissapears.
Is anybody else experienced this? Well, not a showstopper, but a little annoying.