I can’t find a reason in the log other than the flip dialog was still open when it shouldn’t have been. Can you take a look at this? I tried to close SGP and it hung at saving the sequence so I used Task Manager to kill it and start over. It did not save the sequence.
This is another instance of a “Windowing” issue where SGPro fails the sequence because it can no longer control its windows (in this case the meridian flip status window). I do not know wht your system seems more susceptible to these types of issues, but I will look at making this failure less severe than its current “unrecoverable” status.