I wanted to import the posts from another wordpress site, so I exported an xml and imported it into my new wordpress site. But when I did that, I got the message your "..updating your database. Click here to do it." And I did, and everyting I had build up in the new site dissappeared! Lyckily I had only worked for a day... The worst was that no post or pages were imported into my new wordpress site, don't know why.