Hi Paul
I had something similar when i first tried PHD and it turned out that i had accidentally selected AO (adaptive optics) in the set up procedure. if you have drift aligned it properly then the issue is likely to do with the set up of the software and like Wayne said, you will slap yourself when you find the issue. it is difficult to diagnose from limited information so perhaps the best idea is to attach some screenshots of the set up process and settings
Aidan
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