Hey Arie,
I had a close look at your logs and there really doesn’t appear to be anything strange in what SGP is doing or reporting in the results it get’s from the guider or camera.
As an example, looking at m42_30sec_1x1__frame1-2.fit
It shows some clear movement of the stars in the captured image. Looking at the some of the key events in log file, all looks normal:
[03/14/19 21:29:22.166][DEBUG] [Sequence Thread] DoEventGroupChange: Slewing to target
[03/14/19 21:29:32.506][DEBUG] [Sequence Thread] Telescope: Slewing has completed
[03/14/19 21:29:32.506][DEBUG] [Sequence Thread] Telescope: Settling for 5 seconds
[03/14/19 21:29:37.507][DEBUG] [Sequence Thread] Telescope: Settling has completed
[03/14/19 21:29:38.654][DEBUG] [Sequence Thread] ------------- Starting capture frame for event[0] -------------
[03/14/19 21:29:38.718][DEBUG] [Camera Thread] SGM_FOCUSER_AUTO_FOCUS message received…
[03/14/19 21:29:38.720][DEBUG] [Camera Thread] Checking for auto focus…
[03/14/19 21:29:38.737][DEBUG] [Camera Thread] SGM_FOCUSER_AUTO_FOCUS complete…
[03/14/19 21:29:38.914][DEBUG] [Sequence Thread] Resuming auto guiding (settling)…
[03/14/19 21:29:38.915][DEBUG] [Sequence Thread] Waiting for Auto Guider distance to fall below 0.5
[03/14/19 21:29:38.924][DEBUG] [Sequence Thread] Distance is below 0.5, starting timer…
[03/14/19 21:29:44.064][DEBUG] [Sequence Thread] Distance stayed below 0.5 for 5 seconds, done settling…
[03/14/19 21:29:44.100][DEBUG] [Camera Thread] SGM_CAMERA_CAPTURE message received…
[03/14/19 21:30:14.638][DEBUG] [Camera Thread] SGM_CAMERA_CAPTURE complete…
[03/14/19 21:30:15.291][DEBUG] [Sequence Thread] Created full file name: C:\Users\arie\Desktop\SharpCap Captures\test\Light\m42_30sec_1x1__frame1-2.fit
There was no dither for this image, but you still ended up with star trails.
Are you sure that there isn’t some slop somewhere in the imaging train: focuser, camera attachments, scope/mount attachment etc? And was it windy on the night you were imaging?
To me it really looks like some external factor (not the s/w or drivers) that is causing the issue.