Extraction previews don't seem to be working, shown on two machines so far. I don't see any errors in the log, just previews aren't showing up despite having Enable preview checkbox checked, status shows "Waiting for preview..."
Previews during conversion seem to be fine.
Haha I don't believe it, it worked. Here I was thinking underscores are the perfect way to visualize spaces without violating popular naming practices, and it turned out to be my downfall 
Good job getting that sorted out quickly, hopefully the end of that problem for so many people.
Here's one I had in the archives, it's from 2022 and loads just fine into the Manual tool. You can save the alignments after making changes to them, and it will still exhibit all the problems we're describing.
I think you're right, those glitches may have been byproducts of some version mismatching. Doing a fresh run seems to work just fine now, thanks for looking into it.
Yes once I corrected the underscore in the args it definitely started working properly again. As it's a script I'm using, I worry less about the length of arguments and more about the readability of them haha