I just discovered a similar problem but mine is more specific.
8 of the effects are completely normal. However anytime Rotary or Flanger is selected, the volume cuts out almost entirely. It is only on those 2 effects and happens whether I select a preset that is based on them, or if I just select it with the knob. No change in parameter fixes it.
I'm going to try a restart 1st and see if that fixes it.
