So by telling it to use master page size its corrected the issue. However lements I had pulled from the master into the main document have been deleted.
I understand the applying a new master does just that, but why has it removed elements of the previous master I removed from the master? Thats crazy!
Um very frustrating, in short it was a single page that was portait. I changed to landscape. Everything including the master would imply I am in landscape but when inserting pages its responding to the ghost of portrait.
Did you change the orientation in "Document Setup", or did you use the "Rotate Page View" in the Pages panel?
This will sound dumnb I know but basically I only reused this portait document because for the life of me I cannot remember how I organised the page titles to work.
But anyway I opened the document which is just the single page. then went to document set up and rotated it and everything seemed fine only its not