Same problem as here: why do I get "Access Denied" at certain web sites when I didn't last year?
But: unfortunately the answer didn't help. The access to some sites is constantly denied even with using Vidalia to switch to a different identity and turning off NoScript 220.127.116.11.
using 5.0.3 on Tails 1.6
Edit: The subpages on one of the websites are accessible, well, at least they have been from time to time. So the website itself apparently does not block Tor nodes.