Everytime i log in with my password, it says "Welcome Robsten [which is the username]" but then it appears the main page like if I had never been logged, and i have to go to "Forgot your password" and change my password, everytime i wanna enter!, it's very frustrating.
Why do you think this is happening?
Post a link to your gallery for a start.
www.robertandkristen.org/gallery
Check if this is related to your custom theme: try using the classic theme temporarily by going to http://www.robertandkristen.org/gallery/index.php?theme=classic and try if the login then sticks.