Same happens for most of the postings in my blog: miromir.wordpress.com
The strange thing is that in some cases it is able to load successfully in 5-10 refreshes.
But most of the times it fails to load.
At first I though this might have something to do with database overload. But then again -- editing a page is never a problem. I can normally edit and save the posting, but the viewing problems still persist most of the time.
Also, I think the problem is not connected with the UTF-8 characters in the URL
Because I changed the URL of the posting to use numbers instead of the UTF-8 characters, and the behaviour remained the same.