While it’s become apparent that the stuttering / sync issue so many are reporting is independent of the XBMC version used, I have found a separate issue with 12.3
I’ve been trying to use a remote keyboard - either from my Android phone, my iPad or my computer - to control and setup XBMC on my Apple TV. So many tasks are ridiculously tedious with the Apple TV Remote - such as trying to enter in the names of all the TV shows I want to add in my addons, etc.
I have found, bizzarely, that while remote apps are working, any attempt to use them for text entry fails.
When looking around, I found this thread: http://forum.xbmc.org/showthread.php?tid=181729
It seems that 12.3, for whatever reason, has broken the ability to use remote control apps - be they using the web interface or other interfaces - to allow for text entry.
Thus I think I’ll be downgrading to 12.2, if I can figure out how… anyone want to point me in the right direction? It would make for an informative second post on this topic