Nasty IPCB Crossfader Bug

Nasty IPCB Crossfader bug.

Repro
Patch 2 fixtures, set both to 20% and Blue and Record to Master 10 (simulating Main show List)

Clear Programmer.

Take one of the fixtures, set to full, White and Record to Master 9. Set fader to IPCB Crossfader.

Clear Programmer.

Play Master 10.

Raise Master 9 to 100% then back to Zero, then to 100% and back to zero. All OK.

Raise Master 9 to 100% then back to a value not zero, then to 100%. Now as soon as Master 9 moves off 100% again the intensity instantly snap releases back to Master 10 (20%). Colour releases as normal.

Cheers

Colin