Some users report problems with using d(- -)b when iTunes Match is activated on the iPad.
We checked these reports, found the culprit, and an update is on its way to Apple!
For the time being, if you are bugged by this bug - please disable iTunes Match on your iPad. (All your songs will stay on your iPad, you can re-activate iTunes Match as soon as you have downloaded our update - your iPad will inform you...)
Have fun to play with d(- -)b!