You need to uninstall the product from vB, delete cookies and cache, and you should be back where you were before. Also delete all the files and folders from WP and vB via FTP.
Shame there is no solution to this.

It's working on vb 4.2.2 wp 3.8 and php 5.4.23, i have no problem..

Same here, although I have a weird issue.
I use a plug-in for category to transform them in subdomain.
sub.domain.com and I can log-in (added the subdomain in vBulletin whitelist) but it is redirected to www and if I go to sub.domain.com the session isn't kept :(

Working perfectly if I disable the subdomain plugin. Anyone had similar issue?

Can i just pay someone to set this up for me?

Anyone had this issue?

Have it installed between VB 4x and Wiki, and there is a gaping hole somewhere on the wiki side that allows anyone to bypass the vbsso and register. I've presented the issue to the developer, but they seem unmotivated to look into it... Suggested a pay for a support ticket on their site, but the option doesn't exist....

My bad, I thought donating to remove the footer might have gotten somewhere when I first installed before we found the issue....

Just remove the code in the wiki for registration and link to your forum registration instead like I did. Works well.

www.wizard101central.com/wiki and www.pirate101central.com/wiki

I did that, they still get in.

Also, not compatible with the current version of Wiki, 1.22.1

I installed the mod to vbulletin, do i need to install the mod for wordpress too to make them work together?

Yes.