Cross-User Rights

HI there

I’ve recently come across a little problem which I didn’t seem to have before. I don’t know what I’ve done to cause it, but basically, my users now do not have editing rights for other users’ content, even when I set capabilities as high as Admin. If I give them ownership of the post/page, it’s fine. But they cannot edit posts/pages that belongs to a different author, regardless of the permissions I set in AAM.

Help?

Thank you!

http://wordpress.org/extend/plugins/advanced-access-manager/