Bentley,
Bug when selecting 'queue selected tracks next and play now' is now fixed -
https://getmusicbee.com/forum/index.php?topic=41426.msg225206#msg225206As long as you are not using the Store version you can apply the patch linked in that post (download the zip file and copy the contents into your MusicBee installation folder, overwriting existing files). Note that this will update your MusicBee version to 3.6.