Last night, 'Failed to meridian flip, aborting sequence' again! 
It seems SGPro finished camera action and can't execute PS2 to finish plate solver, caused timeout and ‘Failed to meridian flip, aborting sequence (True)’.
[2016-9-3 2:59:29] [DEBUG] [Telescope Thread] Aborting solver frame. Time out!
[2016-9-3 2:59:29] [DEBUG] [Telescope Thread] Aborting auto center...
[2016-9-3 2:59:29] [DEBUG] [Telescope Thread] Auto center aborted, closing centering dialog...
[2016-9-3 2:59:29] [DEBUG] [Pier Flip Thread] Recovery mode invoked but sequence is flagged as aborted, aborting recovery...
[2016-9-3 2:59:39] [DEBUG] [Sequence Thread] Blocking Pier Flip: Failed to meridian flip, aborting sequence (True)
The log file: sg_logfile_20160902231534.zip (234.5 KB)