the html/css code used for the update site does not work in Safari. the Jaascript code needs to be updated.
I did some research (Safari has a very nice debugging environment, including setting JS breakpoints and inspecting variables) and it seems that the code to load the page is not standard, at least I could not find the document.load() method in the specs I read.
further readings are required...
the new p2 repository format no longer includes a classical web site.