We already had this problem once. It could depend on your browser
settings as I have similar problems with another website. The last time
I created the account for the user and he then changed the password
after login - this worked well - we could try it this way.
Could you please try to edit an article and see if you can save it? Not
that your IP is locked due to some vandal that was around (there were
quite many during the last weeks).
Please let me know - you can also contact me by private e-mail
I'm not able to create a new account in the Italian page.
Though I used the same "user name" into your English page
and for registering in Wikipedia, then on the Italian page I always
get an "error". Even if I use different "user name" the site
accept it !
Since I'm an Italian people I only should work on the Italian page,
so please help me replying to:
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