Yes. I tried it in chrome, firefox , IE, Safari from both my home and office pc.

In firefox tumblr.com is returning a file with mime-type : application/octet-stream while in others it is displaying this message -

We're sorry Our servers are over capacity and certain pages may be temporarily unavailable. We're working quickly to resolve the issue.

I'm from India. Is there any possibility that they use different servers for customers from India?