Hy,
I ran into a similar issue to this one last night when trying to us the polar align with platesolve. Can you confirm if your code change is integrated into 3.6.5? If yes, then I may have a different issue causing me to get the "Solver Failed" message. My experience was this:
1. Start Polar alignment
2. Capture all three images and plate solve successfully.
3. I would start the refresh and it would refresh twice, I would try to move the AZ knob and then get the dreaded "Solver Failed after..." message. What's worse is that there's no recovering from it without stopping and restarting the Polar Alignment process.

If your changes are already in my version, I will start a new thread for this.

Thanks,
Anand

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