PBWiki tells me to log in to do things, even though I'm already logged in

How come I can't edit the pages of the wiki of our group? I already have an account, I have my own wiki page, our group wiki is public, and I STILL can't edit it. Heck, I can't even view user profiles. It tells me to log in, but I'm already logged in! I already refreshed, I already relogged in, didn't help.

Please help, I'm getting a bit frustrated. >_<