I can only join you in asking what it could be:

I have two sites Both using the Same Theme and yet the one works fine and the other is messed up.

So I'd like to know what can cause problems too.

OF course the one not working is my active site so I may have to downgrade until I know what will fix it.

Update: I upgraded to 3.01 and the array fix, but still have the same problems -
1) Menus are expanded
2) Forums do not display on home/index page
3) Poster defaults to guest_
4) Added a forum in admin and it - didn't :o(

I do see some great improvements and some increase in speed - so I'm really wanting to get this fixed :o)

Thanks to all!

I haven't looked too far into this, but I did notice the li:hover in newbb_menu_hover.css - expect to have problems with this in IE6 and lower. My understanding is that pseudo-class only applies to links in IE.

See here

This is what I just did:

1) Went to my MySQL database and backed up entire database and then just the BB fields for data only.

2) Went to Admin/Modules and uninstalled Forum
3) Re-installed Forum (3.01)

4) Went back to MySQL and emptied the BB (only) fields to remove the test forum

5) Did a SQL and added back the data I copied from the original fields.

Now my forum looks correct and although I haven't tried the admin side - I am sure it will be fine :o)