{Off Topic}
Because it’s a major code branch as they call it.
There have been several Release Candidates since 1.0.7 numbered starting 1.1 up to 1.5 RC3 which was the current build till last week when the release the Milestone build 1.5
Software developers are funny about this. If you think this is odd take a look at ATI Driver versions and Package version it will confuse most people.
Oh and I'm not having any issues viewing the site on this machine or my laptop.