Few small problems
 

Ok, I've just restored my forum database from MySql Dumper.
I'm getting a few small bugs.
The first is everytime a thread is opened, at the top of the forum this comes up:
Warning: array_sum() [function.array-sum]: The argument should be an array in /includes/functions.php on line 4364

The second problem is current users online, all the usernames are next to each other, no spaces, so it makes the forum look like one huge usernamed person is online.

The third problem, when I click on a forum category, to open up posted threads I get this error:
Unable to add cookies, header already sent.
File: /home/pdurkin/domains/theclubkids.co.uk/public_html/forum/includes/class_core.php
Line: 3177

Thanks for any help in advance.

Did you also move to a new server or upgrade MySQL/PHP?

Sorry, the two MySql errors have gone, thats all working now.
Just the users online have no space or punctuation between.

--------------- Added [DATE]1208964577[/DATE] at [TIME]1208964577[/TIME] ---------------

anyone?

Have you tried reverting the template "forumhome_loggedinuser"?

Sorted it, cheers for the help.
One more thing, peoples profiles are the old version. How do I get it so its that myspace like profile, with comments and pictures etc?

Usually that is a result of either reverting a template (I think header_include) or the additional CSS that vbulletin added in the bottom text box in the Main CSS part of your style.