I've installed WP-Member and it was working fine earlier in the day. Now, whenever we try to register a user we see a blank screen with just one error message:
Error: Are you sure you want to do this?
I disabled all plugins except WP-Member and it still had the error. I deactivated and reactivated WP-Member. Still happens. We are running WP 3.5. I'm now completely stumped and would appreciate any help.