Okay - uploaded backup copies of header.php, footer.php, and config.inc.php.
This got everything working again, to a degree - the header, footer, header insert files were all blank.
However when I try and update admin/gen_display.php I get
Forbidden
You do not have permission to access this document.
Also when I view /admin/phpinfo.php
I get
Forbidden
You do not have permission to access this document.
I can update say admin/features.php without any issues. I cannot see any permissions issues and have re-uploaded the files.
Running
mysql 5.0.22
php 5.1.6
All very strange
