Hi Signals, thanks for your input.
I tried all that you suggested, leaned the file right down and then told DVDFAB to get on with compressing the original down to BD9 and burn to disc. The same as I did the other day but to BD25 ( which worked perfectly ).
I am still getting two major problems.
Everything appears to go to plan during the compression process etc. When I view the BD9 file produced, the graphical intro screen etc looks perfect, but once the video begins proper, the picture is VERY pixelated and almost has a 'brushed' appearance like an effect from Paint Shop. It plays fine and the audio is there.
If I automate the process and it tries to burn directly to disc I get the "failed to burn to disc, do you want to retry " message.
I have set it for BD9 from the start. If I try to burn the file from the image made, I get told to insert a BluRay Disc. Why is it asking for a BR disc to burn BD9? LOL. I am loosing it!! LOL.