Sadly I had to go back to 2.2.2 on my Prime 4. My Prime showed very strange behaviour. When I engaged “fader start left” the FX section of channel 3 became unusable. The fx leds above the level knobs dimmed and fx could not be used while the fader start was active. The same issue with “fader start right” but this one disabled the effect of channel 1.
Back to version 2.2.2 the issue disappeared.