WordPress Error with Membership Site

I thought this problem was because my premium membership here had lapsed, but it’s back today and I still can’t get this to work.

In a few settings on the Membership module, I cannot change things. For example:

Setting a Free level for people that are not logged into the site. The level itself is set, but I cannot select it from the drop down menu listed here:

wp-admin/admin.php?page=membershipoptions&tab=general

That’s the most pressing one, but there are other errors too. When I try to Save Changes, I get this error:

Are you sure you want to do this?

It’s the most recent version of WPMU and the plugin. And I have most of the possibly conflicting plugins deactivated right now.

Please advise.