well, not according to fanoI. Please check the CPU usage with different files / Hz. The "performance issue" could be caused by some bad code in MP itself.But why is the same file playing fine in 60hz... there should be performance issues then as wel?Everyone who is seeing the issue, check the CPU usage when playing the files that are having the sync issue. If you are getting near 50% CPU usage on dual core system (or 100% CPU on single core system) then this is most likely a performance related issue after all. No clue how 24Hz will trigger it, but when you have CPU hitting the limits there will be sync issues as audio / video cannot be rendered anymore on their correct timestamps (same issue can be seen with underpowered CPU/GPU with other video player software as well).