Edit: The original bug still remains, but I've worked around the issue for the time being by removing the trailing
U+3000 IDEOGRAPHIC SPACE from the title of the question (see the answer below for more information.)
I'm having some redirect problems which prevent me from viewing the question #6458: "Adverbial form: 楽しみに or 楽しみで ?".
Firefox, Opera and Chrome all gave a "The page isn't redirecting properly" error or similar and IE8 went on for a long time before eventually producing the below error.
Chrome gave the following:
This webpage has a redirect loop The webpage at Adverbial form: 楽しみに or 楽しみで? has resulted in too many redirects. Clearing your cookies for this site or allowing third-party cookies may fix the problem. If not, it is possibly a server configuration issue and not a problem with your computer.
The message I got after trying this in Internet Explorer 8.0 was:
There are an unusual number of requests coming from this IP address.
To protect our users, we can't process any more requests from this IP address right now.
We'll restore access as quickly as possible, so try again soon.
If you believe you have reached this page in error, contact us.
I think it might possibly be an issue with Unicode similar to Redirect problem for usernames with certain Unicode characters in them.