It seems clear (as previously noted) that we really need to update our source.squeak.org and squeaksource.com images to use an up to date Seaside.
A prerequisite to that is to update our source.squeak.org and squeaksource.com images to be 4.5 images.
Just FYI -- I've done with the source.squeak.org backup on box4. It's running the code which is committed to the "ss" repository of source.squeak.org (so, self hosting its own code) in a 2-month old trunk image.
A future step to update Seaside in there would be nice.