A busy morning here at BitPerfect Global HQ. OS/X Mavericks has been released, together with an update to iTunes, version 11.1.2. I am currently using both, and it seems to be working just fine, but I am also getting reports from BitPerfect users who are encountering problems.
I have been using Mavericks in its pre-release forms for some time now, and have never encountered a problem with it, so I really don't see any reason why BitPerfect users should not be able to upgrade with confidence.
On the other hand, iTunes updates have always been a cause for concern, so I recommend that BitPerfect users hold back from updating iTunes for the time being. I will post an update here in due course.