I need to implement a web forum. I’m still deciding which among the following open source forums to use:

PHPBB3 - so heavy for a simple forum

Vanilla - very minimal feature

SMF - promising features but I haven’t experienced implementing

Fireboard with Joomla – so heavy that I still have to install complete Joomla CMS just for a forum

I haven’t decided yet. But this site, http://www.forummatrix.org  helped me a lot in the evaluation.

We’ve been working on this Vanilla forum upgrade from v1.1.2 to v 1.1.8  for a certain client since yesterday.  After successfully running Vanilla 1.1.8, we got three issues

• Password hash is now different thus users can’t login anymore using their old password.
• Problem in signing out. Maybe because of the customized theme that we use.
• SEO friendly links to the forum (since it is embedded in a custom website) doesn’t work anymore. I’m still trying to figure out 

I really need help to make it work seamlessly.  I almost spent the whole day working on this simple upgrade.