Here's the problem with building on top of someone else's service: when they change stuff, your stuff breaks. Earlier this week it was Last.fm, today it's Grooveshark. The pain! The horror! Well, anyway, I fixed it. If you purchased Musicality directly from me, you can check for updates and everything will be right in the world again.

Of course, if you purchased Musicality through the Mac App Store things aren't so easy. Apple first needs to approve the update, which means a few days of lag time before new versions become available—which is pretty good, when you consider the number of applications they need to review. Hang in there, and the fixes will be yours shortly.