RDWorks 8 can't open it's own files (Donner)

I’ve set up multiple files to run on Donner in the last 24 hours and immediately after saving each run file, closing and then attempting to reopen I’m told that there is a file format error. This is the RDWorks .rld format.
At first I thought maybe it was the hyphens in the filenames thst I was using but then I saved a few with nothing other than lowercase letters and the same thing is happening.

What IS happening here? I’ve already had to rebuild a few jobs that I’ve had to run a 2nd time.