Just upgraded to MusicBee 3.0.5954 on Windows 7. I can only access music from "Auto DJ". If I click on "Music" or a playlist, MusicBee terminates. If a track is playing and I select "Now Playing", "History" or "Music Explorer" MusicBee terminates. If a track is not playing, I can open those items, in a new tab, but the tab is blank; with the exception of "History", selecting open in a new tab still causes MusicBee to terminate. I can select "Inbox" but the list is empty; which is the correct function because I typically don't move files to the inbox.
I turned off Playlist manager thinking that was why I couldn't access a playlist but no change; MusicBee still terminates when selecting a playlist. Right clicking, a playlist, and selecting "Play Now" freezes the playback and opens a dialog box (MusicBee has stopped working) with the option to close the program.
Right clicking "Music" and selecting "Play library shuffled" or "Open in a new tab" MusicBee terminates. Same result when a track is playing or a track is not playing.
In general, any way I can think of to access a music track outside of "Auto DJ" causes MusicBee to stop and exit me to Windows. I downloaded and installed 3.0RC2 twice to make sure it wasn't a corrupted file issue.