If you update the files on the server that breaks login and then give me FTP access and a URL to that site I can debug it and figure out why it isn't working.
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.