Vger - Yep. And I did all of those - checked all overrides (none in conflict with upgraded files) and I also FTP;d the whole lot of the Upgraded files only to the site.

It appears I have to do a complete reload of 1.3.0.1 now and I'm wondering if I need to strip it clean off my site or if I can just FTP the full fileset right on top of the existing install.