Some weird behaviour with the camera tools today. At some point the camera tool created possibly 100 tabs of the same scene !!!
Also even though cameras, watermarks etc have all been deleted from the file, the camera crop areas (16:9) persist in the file, and show up in layout. Cant seem to be rid of them. Tried saving as another file, shut down and reopened etc???
Will probably have to cut and past the model from one file to another if all else fails?