Regular alignment on job start works with either internal solver or ASTAP.
If I set 'Verify captured image position every 2 frames', every other image triggers a 'Solver failed: 16.2s' kind of message. Position drift remains unknown of course. Same story with both internal solver and ASTAP. I tried enabling all sorts of logs but got nothing more from this procedure (there are many unrelated messages though), only that one message at the end.
I see new threads or ASTAP process spawned. The time taken is similar to what it takes to successfully solve an image. I suspect it is actually OK, but results are broken on the way back. I tried actually do 'Load & Slew' with a just captured image. It solved the image nicely.
If I set 'Verify captured image position every 1 frames', KStars crashes right after it gets the first image. Again, nothing from the solver in the logs. I'll try to fetch crash dump next time.