Drums palettes is empty after reopen the drum score file.
1) Create a new score and select "Drumset 5 lines" from "Unpitched Percussion".
2) Save the score to a file.
3) Open the drum score file.
4) Expand the Drums section on the Palettes, notice that it is empty.
Also, the bass drum note does It sounds pretty weird and flat,
it does not sound like a bass drum at all.