I've never seen that happen, MediaMonkey uses the case of the tags when using Auto-Organize (Files). Are you sure your mask doesn't contain $Lower(string) to force lower cases?

Also unless you enable Tools > Options > Auto-Organize tag changes won't change file names.

I've been using MM for quite a while (Gold ), but just noticed it converts file names to all lowercase when it saves modifications (like change in rating). How can I prevent that?
I've auto-organised my library using MM, and it did the right thing initially, file names were like "Electric Blue.mp3", now MM keeps lower casing them to "electric blue.mp3"... I don't like that.

How can I change this behavior and have MM leave the file name casing just as it was?
Or if that's not possible, then I'd like to tell MM to never modify any file... hate the lower case crap

Searched but couldn't find any option that seemed related to this.