phpBB Cookies

So, something bad happened to my forum I run last thursday night, which completely deleted all of the data in my database. That sucks, but we'll move on. My problem now is I upgraded to the latest verson of phpBB, and now my cookie settings seem to be all fuggered up. This means i can't access the administrator panel to let me in to make the forums/usergroups again! So far I've tried everything I can think of, and even posted on the phpBB.com support forums. Hopefully i can get this figured out. What it looks to be doing is writing the wrong domain name in my cookie, instead of www.domainname.com, I get .www.domainname.com, see the extra . in front? That's not suppose to be there!