Question: before I try installing another plugin – does this plugin offer an expiration to the invitation? I tried using the same “secure invites” but I keep getting redirected to a 404 registration page. I’m using other plugin’s to lock down the site to avoid as best as possible crawlers and other peering eyes wandering over the site. I just want to send invites to specific clients (and clients to their clients), and if they do not log in/ register after X days – the invitation is null. I may be having conflicts between Theme-my-login and wordpress access control… but i’m not sure… just trying to fix one thing at a time 🙂