Do you want a SUP file that will give you problems in 4.0.0 and work with this version?
Any anime BluRay will cause that since it has to compose several subtitles at the same time trying to translate everything that is on screen.
But anyway here's a 20 kB SUP file with a simple composition: two subtitles, one is shown first, then both, then only the second. This is from a real BluRay. Load this with my version first and double click the little screen or use Edit -> Edit Frame and take a look at the three frames so you can see how they are supposed to look in the movie.
Then load it in 4.0.0 and do the same.
If the attachment is not approved download it from here:
https://www.dropbox.com/s/meensn9ow4...ample.sup?dl=0