The thread starter pointed it out as he was seeing it. On page 84 post 2499 Kilian.ca tested it. It was discussed more afterwards.
Also discussion here a bit post #374
"There is a glaring exception to the otherwise competent handling of video however, with the TX-NR818 converting 23.976 (24000/1001) frame per second (FPS) content found on most Blu-ray discs to 24.000 FPS on output, leading to undesirable frame repeats. This problem has been reported to Onkyo, they have confirmed the issue, and are examining the root cause and potential fixes. Because the root cause is still unknown they are not able to guarantee that it can be fixed in a firmware update however."
Thanks fahrenheit! If I have an issue I will set my hdmi output to 'sub'.