I just recently upgraded from MusicBee version 3.1 to the most current 3.5.8447 and I'm using it on a Windows 10 PC.
If I edit a song's file name within the MusicBee app by right clicking on the song, selecting "Edit", perform my edit. then select "Save", I get the following error:
"Error: The following no longer exists at their expected location: (lists file path)"
However, the song name does change and is actually located in the target file path, so it seems to be some kind of bug. Pressing "Save" will not allow me to leave the Edit box, but I can press "Close" to exit.
Not an app-breaking bug, but minorly annoying and wasn't present in previous versions of MusicBee.
EDIT: Also, I should note how I'm editing the names of my songs. I'm using a naming template, so when I change the name of a song I right click on the song > select Edit > press "Rename" at the top > select my naming template > press "Reorganise" > then try to press "Save" to exit the Edit window but get the error.
EDIT 2: I just performed a fresh reinstall of MusicBee 3.5.8447 for Windows and still get the same issue. Again, the error only shows up when I edit a song name using a template. Reverting back to version 3.2 gets rid of the error completely.