Hello,
as there were many spamming accounts created in the wiki, used to add inappropriate content (http://www.kamailio.org/wiki/start?do=recent), I went through them and deleted those having more like random name and random id for email addresses.
Hopefully I haven't deleted any valid account, but if you try yours and does not work, try to create it again.
If you still have troubles, write me mentioning the account id.
Cheers, Daniel