I wanted to ask this question on meta, but it said, I have to log in first (which is where I have the problem!)

I answered a question with this user. But when I tried to  register and click on the stack exchange icon, it only displays three dots (animated) and never comes back.

I suspected a firefox problem so I tried firefox on windows: And yes, I was able to create an account linked with my other accounts ( http://unix.stackexchange.com/users/27867/holgero and http://stackoverflow.com/users/1779245/holgero ) when I ran the latest firefox version under windows 7 in a virtual box.

Then I upgraded my linux firefox to the newest version and deleted the other account under windows again. But still I cannot register this account ( http://superuser.com/users/177338/holgero ).

On unix.stackexchange or stackoverflow I never had any problems with the registration, superuser seems to be different.

So, how do I register this user and have it linked with my other stackexchange accounts?