Re: duplicate key in tiki_sessions - a "solution"
nitio,
This info was very helpful for resolving an error that we experienced related to Scoring and unnecessarily long usernames. The affected users had usernames consisting of their full email addresses - first_last@mail.domain.com. When they tried to read certain blogs, they received a "duplicate key" error related to the event_id variable in the tiki_users_score table for entries like UserName-blog_is_read_User_Name@mail.domain.com:2, that had around 60 characters in some cases.
Solution: Drop the "@mail.domain.com" from the usernames. 
(Who the hell wants to type all that in each time anyway?)
Thx,
))MacLeod((
;){kind=link}
;){kind=link}