I have almost never had problems with PS2 plate solving, but tonight, it failed repeatedly. I know there are several parameters that can be adjusted, but tweaking a couple of those had no benefit. I ended up using Blind Solve (Astrometry.net) as a failover, but of course it is slower. Interestingly that too failed at the end. No, there were no clouds. I was using 30 second exposures. Aren’t those long enough? The focus seemed reasonably good, at least good enough that plate solving should have worked I thought.
I see from the forum archives others have experienced this behavior as well. Has an answer ever been found why this sometimes happens even on the same target? What are the things that make PS2 fail? What do I look out for? What do I adjust?