Hi Greg,
I had a similar issue recently, somehow my PEC got all wacky and threw out my subs. I used the wizard in theskyX to refine my polar alignment and now it sais my error is 0" and 0" to the refracted pole. New PEC run via pempro showed no drift from polar misalignment, the new PEC resulted in +/- 0.2" corrected. I now have perfect tracking again. I'm assuming the constant nights of -6 here have probably contributed to whatever suddenly threw off the usual perfect performance I get from my mount. 30minute guide logs are a flat line and I had a few subs with 1.3" FWHM at 2.5m focal length.
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