I have noticed some strange guiding behavior after a meridian flip, using PHD2.
After the centering process completes, the guider starts up again, finds a star and starts guiding. The tracking error is brought back down to sub-pixel level and then it suddenly goes bad again, like a dither command, before settling again and the event exposure kicking off.
I have dither enabled - does SGP do a dither after guider settling, immediately following a meridian flip? PHD normally labels the dithers - but there is no label on its tracking graph, hence the question.