Calibration fails at calibration step

My setup:

4.0 upgraded to 4.1
8’ x 8’ horizontal frame (actual anchor points a smidge larger as they are outside the frame proper).
Planned 4’x4’ working area currently 1" foam spill board and 1/4" hardboard test sheet. 8" over run area all around working area.
V 0.88

After a few missteps I can extend the belts 1700mm to hook them to the anchor points. I then retract all and the belts tighten. When I select calibrate the tension is released and then the spools slowly start unravelling. I stopped it the first time once the belts started reverse spooling on the drums. Subsequently I’ve stopped after a minute or so.

I’ve tried starting from scratch several times with calibration sizes of 9x9 and 7x7. Also varying the grid size from 1500mm square to 1000mm square. Always the same result.

I’m running the unit on the Maslow default network using an android phone running Firefox as the controller. Unit is inside a climate controlled building at about 18°C.

Any ideas?

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Reloaded all three files and calibration went through.

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