what access restriction is applied to the user update page?
sounds like you have the restrict access behavior on the user update page, and you are redirecting to the user update page if access fails causing an endless loop.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.