MIDI Keyboard Drum Input Incorrect
When inputting on a drums staff with a MIDI keyboard, pressing any single key on the controller while a note is highlighted on the drumset palette results in the highlighted note being input instead of the note corresponding to the key pressed. There's no intuitive way to deselecting on a drums palette (such as clicking on the empty white space on the palette).
The only workaround I found was with 2 drum palettes. one with more notes than another. On the larger palette, select the note in a slot the smaller palette doesn't have (ie, if the smaller palette has 8 notes, select the 9th, 10th, etc. note on the larger palette). Then switch back to the smaller drum palette. This will deselect on the smaller palette, allowing you to use MIDI entry like normal (but only on a palette that has fewer notes than the original highlighted note).