Thanks Mc,
I've already deleted the file and re-uploaded it from the original files that I got with the template, that's the really strange thing about it!
When I check via FTP, I can view the contents of the file. There are 567 lines of code there. Yet when I try to browse to it, it's as you say - completely blank!
I can't even come up with a theory, however implausible, that might explain it.
Here's a screenshot from FileZilla with the file open. You can see the file size, permissions and ownership in the background.

Bookmarks