Chris, Hi, typically I'm trying to stack between 8 and 12 lights, with 30 bias, 30 darks, and 30 for each of red, blue, green and Lum flats. So, a total of circa 200 files. I do get a stacking toolbar which lasts for say 30 seconds but then the process seems to stop, the progress bar disappears and then no further activity.
I'm happy to upload some files to you into a private Dropbox folder for you to try and reproduce the problem. Do you want all of the files I mention above or just a smaller sample? I use Dropbox to receive my Astro .fst files from a remote telescope that my Astro club friend owns, so I have a Dropbox account already if that helps? Let me know what you want to do please?
Thanks for your help so far...
Nick