It has happened twice (not always):
Stage connected to iOS RM on an iPad. I select from the stage another performace, press the switch of the slot that I want, it activates...but the Rig remains the one that was previously active (it even shows the name of the previous Rig on display together with the new performance name). If I go back and forth still remains the same Rig. If I select a third performance and switch on a slot, and then go back to the one I wanted, then it works again all normally.