Ableton Endless encoder snaps back

I had this ages ago, and can’t remember what was the cause.



I’ve not used my controller for ages (and have since upgraded Ableton).



Basically if I assign an endless encoder to something like a volume fader, or in this case the Filter frequency amount, it goes up or down ok, but always snaps back to the central value rather than just stay where I left it.



I did a quick search as am sure this came up before, but my brain can’t muster the same words someone else would use it seems?



I also tried the different take-over settings in the midi section, no joy there either.



Its been a bad computer day all over tho tbf

Nobody? Hmm, I thought this was a more common thing than it seems to be.



Googling returns eff all, which also seems weird.



Reading in the manual it implies that relative controls just send +/-1 signals, so I still don’t know why it returns to the middle value on release.