I've just jumped into the field and purchase my first tube (Mak90) to be able to capture better moon shots - until now I was shooting with my DSLR and 55-250mm Canon + X1.4 converter (560mm total).
My combo is PIPP, Autostakkert and finally Registax to apply wavelet. Until today I had no issues. I've already completed successfully this with a video file from my DSLR. But as you can imagine I want to go even closer, so I have to go with the still shots.
My Canon 77D produces 6000x4000. My Autostakkert export is a TIFF file, 3600x3600. Registax loads it with no issue but when I am trying to apply my wavelet I have this result.