I copied Default and modified as DefaultRBC but when I view the list of themes, it shows only 2 installs of Default, not Default and DefaultRBC. I have to switch to Options (Themes) to see it's mine. Now that I can change them for each album, I wanted to be able to better distinguish which version of Default I'm using. (Am playing with that one for now).

You have to change the file "theme.txt" within the theme's folder.

Thanks, modified okay. As they're in their own folders, and I update Themes per theme, they should stay put.