Wayne,

Assuming you have set up image scale accurately in APPM have you tried setting up All Sky plate solving as a backup for when the normal plate solve fails? It's an option in APPM's plate solve tab. This helps if the problem is just that the mount coordinates are not very close to sky coordinates.

There is also a feature in APPM to perform test plate solves on the plate solve tab. You can use that to make sure plate solving is working since each plate solver is different. If you are using APCC 1.8.0.9 you can set the camera type in APPM to "NASA Sky View" for daytime testing. It will download an image in the proper image scale using the mount's RA/Dec pointing position. Not many people seem to know about that. :-)

Anyway, that's all I can think of for now. I'm probably not going to be available again until this evening, but I can help you more at that time if you still can't get any further. In that case It would be great if you could use APCC's log zipper to capture logs and send me a private email with a dropbox link to the zip file.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro
Author of PEMPro V3: https://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver