Quote: the above does still not answer though how the same batch of blank blu rays on the same players, one movie created worked and one created did not - so it must be something to do with how powerdirector is creating the discs?

It may have more to do with the software/firmware in the player that does not play PowerDirector created Disks.

If you have 10 or 100 players that do play PowerDirector Created disk, and one player that does not, I would blame the player that does not.

Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.

the same player plays one movie created by director on a blu ray, and the same player does not play another movie created by director on same batch of blu ray disc - so it can only be director that has done something different when the disc was created (both movies were exported using the same res and settings)

Quote: the same player plays one movie created by director on a blu ray, and the same player does not play another movie created by director on same batch of blu ray disc - so it can only be director that has done something different when the disc was created (both movies were exported using the same res and settings)

That is a good conclusion.

The question becomes what is different?

Same batch of Disks...not the problem
What is different in the material? What videos were used? What Effects if any?

Did you use H.264 or MPEG-2 encoding?
Did you use a different Menu on this disk?
Any change of the TV Mode? NTSC vs. PAL?
Did you do 3D disk instead of 2D disk?
Did you do 24P instead of 60i?

There are a lot of settings in create disk module that some players may not be able to play.

Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.