Well I tried 10 in the filters settings on the SS. I also tried 1 just to see what happened.
I didn't have any bounce problems so clearly 200 is probably excessive, however the new filter values didn't solve the problem.
Using smaller numbers seemed to change the amount of Y movement reported in the DRO but it still happens.
I have now set things to 10 just for reference and future testing.
What I have found in testing this that it only happens when the Y axis is non-zero. (the Ref-y led is red) if it is .0001 it will move to something like .025, if it is zero it will stay at zero.
Clearly something is happening here in Mach where it decides to move this non zero axis when zeroing another axis
darren