Well, the flip didn’t happen because you told it not to.
- Wait For Meridian is unchecked. This means if the mount isn’t to the time to flip, SGP will start the next frame…regardless of how soon the flip comes. If this is checked, then if “time before flip” < “exposure time of image”, SGP will wait for the flip, perform it, and then start imaging again. Since you state “8 minutes remaining until the meridian flip was scheduled”…SGP started the next frame.
- Minutes Past Meridian to Flip is 8. Line 56 of your log shows this point had not been reached.
PHD appears to have “run away from the guide star” during a dither settle…not sure why that happened. I don’t THINK SGP ever tells PHD (or should have to) anything about “Scope is on this side”…that should, if memory serves, be the mount driver’s job, if anyone’s. Your log snippet suggests the same thing…doesn’t appear to be any signal form SGP that PHD should be doing anything different, or that mount side of pier has changed.
Frankly, I have a hunch that SGP not flipping is a bit of a red herring…true, it didn’t flip…but it had been told not to yet. So, it appears to have been cruising along quite happy, well aware of where everything was and what it was doing.
PHD log for that time period might prove helpful, to see if perhaps the mount driver told it something erroneous?
As for whether the Reverse Dec box should be checked…hard to say, since you don’t say what mount you’re using. That setting’s pretty mount-dependent ime.