Les722

New Orion pics this evening and stacking worked perfectly (50 lights, 25 darks, and 25 bias). FYI: I am using a Skywatcher Espirt 100, iOptron AZPro mount, and Canon 800D with field corrector.

Interesting find last night. I went back a couple of weeks to the subs I had used successfully, and was able to complete the stack with these. Same equipment, location, target, and number of subs as the recently failed stack. Only difference was the exposure time, 15 sec vs 30 sec on the failed stack. The mount I am using is the iOptron AZpro, so per the above thread could I also be experiencing a focus issue using the extended exposure time?

I am using the free trial version on a Mac and have the same issue. It was working fine for the past couple of weeks, and now just hangs during stacking. The apply button is never activated now matter how many or what type of frames I am using.

Downloaded new version (1.9.2) yesterday. No fixes have been incorporated to address the stacking issue.

Astrophotography stacking suddenly stopped working, regardless of how many and what type of frames I am stacking. I have been using the SW for a couple of weeks and everything was working as advertised. I am using the 1.9.1 version (free trial) on a Mac.