Ok, I think I know what is going and but not why. It appears that SGO is sometimes failing to provide the plate solver with the image scale or is providing a bogus one. Like others all of a sudden my plate solves are failing. This is a sequence that just happened to be. Slew to Capella, center – all fine. Establish best focus. Slew to NGC4565. Start center and rotate. First solve fine (PS2) move mount request a 42˚ rotation (manual rotator), 2nd solve fine request a 4˚ rotation, next solve failed. Blind solve fail over to my local astronometry.net failed (this may be because I just upgraded from Win 8.1 to Win 10). Now I deperatey try Pinpoint - fails, PS2 again fails, astrometry.net on the web, fails (it is possible I did not wait long enough). Scratch my head do some imaging. Slew back to Capella, center – no problem. Slew back to NGC4565, center fails (PS2). Ok, so I’m suspicious. I invoke the solver on the last plate solve frame. It asks me for an image scale and I give it .39 which is the 1x1 scale even though this was a 2x2 frame. PS2 solves it in a flash. Go try center and rotate again the first plate solve succeeds but the next fails. It seems as if the routine is wiping out theimage scale value which I assume it gets from the camera spec and scales as needed by the binning. Of course I don;t really know what is happening here, but plate solving (not the solver itself) is failing badly and greatly impacting my imaging flow (one the first decent imagin night in weeks – isn;t that always the way)