In BB Manager, make sure you check/tick the kit in the list so that it is synchronised to the SD card.
For BB Loader on an M-series mack, the following worked for me:
Install the JRE: https://www.java.com/en/
In the mac terminal, try the following:
cd /Applications/BeatBuddy\ Loader.app/Contents/MacOS/
./universalJavaApplicationStub
Be careful of using both BB Manager and BB Loader. BBM works on a project on your computer and synchronises to the SD card, BBLoader works directly on the SD card. If you use both, you’ll have to make sure you keep things in sync.