Fields aren't there to calculate CMD yet.
CMB works fine for me on that sheet. I tried changing size, it updated, changing BAB (on all 3 rows) and all fields actually on the CMB row, worked for each.
You have to actually leave the field before updates happen.
What browser are you using (not that I think it should matter but who knows) and exactly what are you doing that doesn't trigger an update. Also, you could try clearing your cache but I've had no problems between code edits with anything getting cached.