[jnrubyrubyruby]

JR,

The song titles in your screenshot all start with a dash. If you start a song title with a symbol such as a dash, it's going to be put in the # category, which is all numbers, symbols, etc. So that's probably the source of your problem.

Mike

Thank you for this -- your explanation makes sense but none of my files or song titles start with dash. Here's a demonstration of this -- 
in this shot you'll see that the letter sidebar doesn't show "D."
https://imgur.com/a/ygAM54o

When I open one of the "D" titles, the title is just a normal name that should be sorted with the "D"'s:
https://imgur.com/a/LhUtRrw

I have double checked that no filters are preventing sorting. I'm stumped about this -- I have not seen this happening until recently, and I don't think I've altered any settings that would affect this.

Thank you!
JR