I am going to assume you're in the US and if so, all Blu-rays are shot in 23.976 FPS (or at least I have never come across anything, but that) Blu-rays in the UK are running at 24 FPS.

I believe that Cyberlink can't distinguish between the two frame rates or refresh rates and there for the default refresh rate it chooses is 24 Hz. What I do is set my refresh rate in the control panel (in my case NVIDIA) to 23 which is 23.976 FPS or Hz.
This matches the frame rate to 99.9% of my Blu-rays and they play well. (my other .1% are from the UK and are 24 FPS)
Power DVD still throws up the message asking if I want to match the refresh rate because it's trying to put it back to 24 Hz.
I ignore the message and tell it not to come again.

I am also assuming that Power DVD is set to 24Hz and can't distinguish between the two, but just from my own personal experience, my assumption is probably correct.

Hi, thanks, it was a simple switch to 24Hz in Nvidia control panel!

Thank you!

J

What I do is set my refresh rate in the control panel (in my case NVIDIA) to 23 which is 23.976 FPS or Hz.

Tried that as well and that did it for me too. Thanks! Windows 7, i3, 4GB RAM.