OnStepX is ongoing, and the beta is actually very stable. Howard is just being conservative and want to get more community testing before he brands that as stable.

I don't use an Alt-Az mount, so can't tell what went wrong.

But you should ask these questions in the group, where there are some Alt-Az users who may help.
Before you do this though, try to test the same sequence indoors during the day.
Once you have a reproducible sequence, the problem becomes obvious to others, and therefore easier to solve.

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