Thanks for the logs. According to the logs the ASCOM driver returned a stale camera frame from before the meridian flip. I think you will have to bring the issue to the attention of the ASCOM driver developer (Atik). I’d be glad to talk about it with Atik if you want to put them in touch with me (andy.galasso@gmail.com)
Here are the details from the logs to support the conclusion:
the last complete exposure before the meridian flip, note guide star position = (460,164)
21:23:59.872 00.000 6820 ScheduleExposure(3000,3,1) exposurePending=0
21:24:03.252 03.166 3956 Exposure complete
21:24:03.286 00.000 6820 Star::Find(25, 460, 163, 0, (0,0,0,0), 2.0, 0) frame 1786
21:24:03.286 00.000 6820 Star::Find returns 1 (0), X=460.45, Y=163.81, Mass=25859, SNR=97.1, Peak=4520 HFD=2.8
next 3s exposure begins
21:24:03.308 00.000 6820 ScheduleExposure(3000,3,1) exposurePending=0
21:24:03.399 00.000 3956 worker thread servicing REQUEST_EXPOSE 3000
SGP tells phd2 to stop guiding for the meridian flip:
21:24:05.474 00.102 6820 evsrv: cli 04D3BC28 request: {"method":"stop_capture","id":1004}
21:24:05.474 00.000 6820 StopCapturing CaptureActive=1 continueCapturing=1 exposurePending=1
PHD2 tells the ASCOM driver to abort the exposure (2.1 seconds into the 3s exposure), and the ASCOM driver reports that the exposure was successfully aborted
21:24:05.528 00.003 3956 ASCOM_AbortExposure returns err = 0
21:24:05.528 00.000 6820 OnExposeComplete: Capture Error reported
PHD2 has now stopped; SGP finishes the meridian flip
[02/21/18 21:26:27.959][DEBUG] [Telescope Thread] Telescope: Syncing to J2000 RA: 6,30289361587789 Dec: 22,6248376659468^
[02/21/18 21:26:28.043][DEBUG] [Center Scope Thread] Automatic Auto Center Success - Total Error <= Allowable error: 1,4 <= 10,0
PHD2 starts looping
21:26:32.725 00.000 6820 StartCapturing CaptureActive=0 continueCapturing=0 exposurePending=0
21:26:32.730 00.005 6820 ScheduleExposure(3000,3,0) exposurePending=0
camera frame arrives, it is a stale frame from before the flip. We know this because it finds the same guide star @(460,164) from before the flip
21:26:35.825 03.074 3956 Exposure complete
21:26:35.882 00.000 6820 Star::AutoFind called with edgeAllowance = 0 searchRegion = 25
21:26:35.958 00.000 6820 Autofind returns star at [460, 164] 76.7 Mass 26275 SNR 97.5
next exposure – a valid camera frame, phd2 finds a weak star nearby in the search region @(476, 141) and locks on to it
21:26:36.010 00.000 6820 ScheduleExposure(3000,3,1) exposurePending=0
21:26:39.104 03.094 3956 Exposure complete
21:26:39.139 00.001 6820 Star::Find(25, 460, 163, 0, (0,0,0,0), 2.0, 0) frame 2
21:26:39.139 00.000 6820 Star::Find returns 1 (0), X=476.29, Y=140.92, Mass=1660, SNR=16.4, Peak=2128 HFD=2.4