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Yes I am. When I was doing my own troubleshooting I specifically tried it with discs I knew worked before. I also tried multiple non-Fox Blu-rays with the same result. Every Blu-ray disc comes up with that message. DVD's work with TrueTheater though, so there's something weird going on.
The only thing that has changed since it worked prior is the video card (and subsequently the video drivers). Moved from Nvidia to AMD.
Have you tried reinstalling powerdvd after you changed your GPU to AMD?
Did you uninstall NVIDIA drivers completely in Windows?
And, for new GPU, it is recommended to keep the driver version as the very latest one that released from the GPU vendor.
Bugs could be many in new software and hardware.
Or, you can contact cyberlink to investigate it further.