Graphics not always displayed

[Lauraine Graham- with the Lord]

A really weird thing occurred recently.

I did a song for a friend but when she played in on her machine there were no graphics, only audio. I did it again, with the same results. I took the discs back and played them on my machine and it worked perfectly. I took them to my friend down the road and played them on her machine, and guess what, they worked perfectly, as they do on the machine of my usual local KJ. My friend said that all her other discs work properly, it's just that her machine does not want to know about my songs.

Then my friend, who is a KJ in London, 'phoned me to say that the disc I had produced for her did not display. She returned the disc, and guess what? Yes, they work fine on my machine.

Why should this be, that the graphics will display on some machines and not others - that does not make sense.

Explanations, views, remedies required please, as this is too weird for my brain to take in.