I am moving to the portable app on a thumbdrive. My issue is that the drive letter often changes depending on what machine I plug it into. Musicbee is able to deal with the library on a new drive letter but Playlists are not working, with the error its looking at the old drive letter.
It works for me on a new portable installation. You say you are "moving" to the portable installation? Does that mean you have existing playlists from a normal installation that you want to copy over? I'm assuming it will only work for new playlists created within the portable version of MusicBee (because it knows not to include drive letters).
Is there a way to edit them as a whole instead of using the properties of each song in a playlist?
If you have existing playlists you want to move, try:
Edit > Edit Preferences > LibraryChange Library playlist format to M3U if it isn't already. (note that this will remove any MusicBee playlist settings you may have had, like custom views)
Use
Notepad or another text editor to open the M3U playlist files from the
Playlists folder in your old library folder.
Remove the drive letter from the file paths to just leave the folder structure of the files on your portable drive.
e.g.
\Music\B\Billy Joel\1983 - An Innocent Man\02 - An Innocent Man.mp3
Portable MusicBee will know to look for the track on the same drive it is installed on.
There could be a few other things going on, so feel free to post follow up questions.
Bee excellent to each other...