It’s definitely not a plugin conflict – I deactivated all my plugins and it still misbehaved. Perhaps a conflict with the Genesis framework?
It’s really odd since this happens in the admin/editor, not in the WordPress-rendered site itself.
The <head> tag is lovely and complex – perhaps I can email it to you instead of posting it here?
my email user name is stephen and my domain is fosketts.net.
Thanks,
Stephen