I had this problem before. When I made my mistake of deleting my blog I asked WordPress to put it back up again. They did. I Already have te domain for 2 years and the nameservers are pointed to the 3 WordPress ones. I tried viewing my site via firefox rather than Safari. I don’t know but could it be a problem because I had switched the nameservers but then I switched back. I can view if I switched to the “.wordpress.com” URL.
I submitted this to support and I wanted to see if this is faster.
Thanks and hope You can help!