I saw your post and Ray’s response on the AP group message. I also image with a Mach2 and SGP v4. It is curious that Ray said that the ASCOM log doesn’t show any request to flip and that the SGP log shows a user aborted flip. In my experience, sometimes these issues can be due to too short delay timeout on the mount and the ASCOM driver. You may want to bump those times up and see if that takes care of the problem. I will follow this thread with interest to see if Ken or Jared have more insight.
One thing that you may want to consider is to review the SGP sequence shutdown events. From the log, it doesn’t appear that when SGP aborted the sequence, it parked the mount. The reason your mount kept tracking is because SGP aborted the sequence and disconnected the telescope but I don’t believe it issued a command to park.
Also, you could have another layer of safety by setting the meridian limit in APCC Pro to either stop or park the mount if the limit is reached. By using the flip offset and sending the offset to SGP, SGP can issue a flip command well before the mount arrives at the meridian limit for a given declination. Finallly, if you use horizon limits you have yet another chance to stop the mount from tracking into the pier.