Hi deepvisual. Thanks for the reply. If I can avoid further purchases re this issue it would be preferable. I am also running Vga.
It seems that the mac os already has some kind of inbuilt software that overcomes the issue, as I mentioned in the first post, it's when madmapper is running when the projector shuts down and boots up that creates the problem. If I close madmapper then shut down the projector and then open madmapper AFTER turning on the projector, the mapped image is perfectly on target.