The forum changed owner, and as the software was still very buggy, sending tons of error mail and not working, they tried to fix it, and then crashed the database, the hoster could restore a 3 weeks old backup, but the vbulletin would not work, and unable to login etc well big problem.
From there we decided to move away from vbulletin, so i had to reimport all the database in the phpbb system, which took forever, and still to this day something are still not all correct, like topic poster name to the second poster, some thanks are missing, and some password will probably not work.
Normally most of the password for old accounts should work, if you have issue logging in, you should be able to recover the password using the mail you used to register the user, if you don't have access to the mail box, or that you have issue with the password, it can be reset manually from the admin so i can set a dummy password for you to login and then you should be able to change it back.
It's linked to recent password encryption scheme in vbulletin, it's used on account that has been moderator, or some old account, and most account created in the past 6 month or year or so, so for these account the password has to be reset in a way or another.
Otherwise hopefully there is not too much bugs, some functions will be added in a latter version like blogging and more social networking feature, if things are not working beside the pw thing, or that some features are missing, don't hesitate to post something here.
All account are unbanned, and all soft deleted threads are restored, all locked thread are unlocked, all restriction/bans/infractions are reset too. Basically i didn't import any of the permission/ban/moderation thing from the vbulletin, and the owner wanted to unban all account anyway.
So here it goes, sorry for the long offline time, but there was still lot of work to do to make the site well working again.