Apple has released another simultaneous update to both OS X and iTunes. Early testing has shown some possible compatibility problems with BitPerfect after making this upgrade. The problem causes BitPerfect to play in a continuous ~6 second loop. While we believe we have identified a potential workaround for this problem, the combined nature of the problem together with the (simple) fix means that once the fix is in place we are unable to re-create the problem. This means that testing the fix becomes a little bit challenging.
We are working with a few users to test out our solution and make sure that it does in fact work for everybody. But in the meantime, we recommend that BitPerfect users avoid this particular upgrade until I am in a position to communicate further on the subject.