We have confirmed that certain Mac models exhibit symptoms such as recording or playback not working properly. We are currently investigating this issue. Updated information regarding this can be found on this page.
We recommend users who operate one of the following Mac models not update to OS X Mavericks (10.9) at this time:
- iMac: Late 2009
- Mac Book: Late 2009
- Mac Book Pro: Mid 2009, Mid 2010
- Mac mini: Mid 2010