Just trying out Vanilla with Joomla 1.0.14 and I have a few problems:
1 'Allow non-members to browse the forum' is checked but when browsing as a guest none of the discussions are shown.
2 In IE 7 as a guest if I click Sign In on the Forum I get the following messages: Notice: Undefined index: 01862e7008fcd34d8d2ce5129781aac8 in /home/davidfar/public_html/dramagames.net/vanilla/library/People/People.Class.Joomla10x.Authenticator.php on line 38
Notice: Undefined offset: 1 in /home/davidfar/public_html/dramagames.net/vanilla/library/People/People.Class.Joomla10x.Authenticator.php on line 41
3 If I login to the site in Firefox I can see the discussions but doing the same in IE, no discussions are shown
4 If I sign out of the Forum as admin (in Firefox), it says I have signed out but when I revisit the Forum page it says I am signed in.
1 is probably a category permissions issue - on the settings page for each category make sure 'Unauthenticated' is ticked as being able to view that category.
2&3 I dont see why IE would bring up a PHP error but Firefox wouldnt...there must be something else going on.
4 sounds like a bit of a cookie problem but I'm not sure how it would be fixed.