UPDATE FROM MABULA
I have had a very rough 2 months unfortunately health wise. I was struck 3x in a row with bacterial infections. The second infection occurred  after a routine hospital checkup and I became very sick. I had to rest and take a lot of antibiotics. Once I was recovering and restarting work 1 month ago, I again became sick. The infection was not yet gone, so even more antibiotics and rest was needed. Needless to say, it took a lot of my energy and I needed a lot of rest.
Finally, the infection is really gone and my energy is coming back step-by-step now and I have started work again. I am terribly sorry to have kept you waiting for support. I will address all outstanding questions and e-mails step-by step and will be on the forum daily from today.
APP 2.0.0-beta47 will come soon as well, a lot of work was already completed before I became very ill, so the release is also nearly ready for you. Beta47 will be much faster actually. Many workflows will be more than 2x faster, mosaics can even be 10x faster than before because registration really received a major boost... all compared to beta46. Â Before I release it, I will make sure that everything is working properly and then I will release it.
I took a set of images last night and initially processed them in APP. During that I came across a problem in processing and something seemingly surprising post processing. I took the normal Lights, then Darks, Bias, Flats and Dark Flats and put them into processing. When I entered the Dark Flats I was told 'That this file type is not supported, or they are locked by another process' the files were Fits images and they were not in use by any other process. Is there a reason for this.
The second thing was that post processing the image as good, with bright colours and sharp stars. I then ran the whole process again through another software package, and to my surprise the stars showed star trails which was not the case in APP. I did not use the tools in AAP except to clean up the background, nothing else. Is there anything in standard APP processing that does a star analysis and cleans this sort of thing up.
I currently am running a trial of APP so the answer to this would be very helpful.
Those are some interesting results indeed. To me it sounds like you had the files open in another package and even though you closed it, there was still something blocking access to them. That's what I'm suspecting.
The second issue is also very strange, are you sure you loaded the exact same file in the other application? If so, did you properly save the stretched result in APP with the save button on the right?
@vincent-mod Many thanks for the reply, I haven't solved the problem with locked files. They were not open in anything else, I have rebooted the Mac a couple of time since and as of this morning it still would not take them. Does APP read the FITS header, could that be the problem?
Ok the other part, I have resolved that. It was to do with dithering, I had to reprocess the images but create drizzle data and reopen them as registered images. After I did that they were sharp
Strange, yes APP reads the fits headers. Maybe the files are corrupt? Are you using an external drive or maybe a location in the filesystem that APP can't access? For external drivers, only SSD's are adviced as you can get weird results otherwise. Try moving the files to a location that you know is accessible.
@vincent-modIt may be, which is why I asked if it reads the Fits headers, is that I mistakenly saved saved the files as Lights when I created them, and I renamed the files post that
