This is totally nuts! When I tried before, I clicked on the link to your name here, then tried clicking on links to a few names on the Question List page and they all worked. I just tried your name and my name on this page again and they're fine.
It's not a browser problem and it's not anything else in your computer. That message comes from the server and I can't imagine why the server has it in for you!
If it was a question of permissions then the server would either re-direct you to another page that you are permitted to see or give you a message saying that you are not permitted to see the page. ... so, it's not that you're not logged in (besides if you were not logged in, your name would show as anonymous) and it's not be that you are not permitted to see these things that ALL logged in members can see.
I suggest that you try checking other than G2G to see if the problem extends to any other things and also add the tag team to this question to hopefully get faster attention.