I am a new user of SGP. I have been able to run simple sequences just fine. Then I went to try to auto-center and it always fails. This is with multiple targets over multiple nights. It always claims my target is below my horizon of 30 degrees, while the targets have all been above 70 degrees. I hypothesize my sky model is wrong, though plate solving has been working perfectly. I am using an iOptron CEM 40G mount and use its hand-controller to slew to targets, then sync. I follow this with SGP platesolving and sync. Tracking seems fine over hours, and I can image through meridian flips, but of course would like to re-center after the flip.
Any more details you need?