Julien
> If this file was created with LyX 1.6 and then converted to LyX 2.0, you > might have found a bug in the conversion routine. Do you have a sample LyX > 1.6 file which reproduces the problem when opened in 2.0? > > Thanks for the comment about noweb and sweave, I wasn't sure if I needed both. I knew I needed Sweave, just not sure about noweb. The file has never seen 1.6, it was produced in Lyx 2 on Ubuntu 11.04, but then opened in the Mac after I had upgraded to the existing 1.6 to 2.0. I did say this in original post, and in the post when I uploaded the file :-) Graham