Hi Peter
Have you programmed your PEC?
Are you mounted on a pier or a tripod?
Are you using the latest daily build for Sky X?
I read on the SB forum that there was a fix for Pro Track with the latest build.
Someone said they need to have the Pro Track tab open for it to work.
I was out last night with my MX and did a short Tpoint run of 50 stars, I activated Pro Track for a test. The star I centred drifted about 50 arc seconds in RA over 40 minutes. I have not programmed PEC yet. And my polar alignment was slightly out in azimuth. And I think you need a pointing sample of over 250 for Pro Track to work effectively.
If your camera is not orthogonal wouldn't you get the same result regardless of the length of exposure? If its blurry or out of focus that is of no consequence to tracking.
Is the trailing in RA or DEC?
If you get really stuck go from the ground up. make sure all your mounting surfaces are tight, pier to ground, pier to mount, mount to OTA, OTA to camera.
If that doesn't work contact Bisque.
I am probably telling you to suck eggs but you asked for it.
Cheers
Phil