Thanks for the reply.
As stated I did search through stuff inc the help files within Vegas but couldnt come up with anything.
Obviously my issue needs investigating further but its definately something to do with Vegas and how its encoding it. Ive never used the 'render as' option, I need to look into it, is it possible to create a disc image this way? I suppose if it is then I can just use that option to create a custom template and use that from creating the discs. It is an odd problem though, I cant get my head round why it caused blurring on those scenes when I created the whole 2 hr disc but just creating a disc from one scene which was blurred and it came out perfect, all using the same basic settings that you kindly gave me in another thread.