Sometimes after Dolphin installation you may see the home page with the only phrase on it: "Cannot apply localization". This means that somehow the language was not compiled during installation. This may have happened because your MySQL timeouts are too short for the installation query procedure.
In this case, you can try to reinstall Dolphin from scratch but before that you should follow these instructions: http://www.boonex.com/trac/dolphin/wiki/ThingsToKnow
But you may also just re-compile the language by entering this URL in the browser:
http://mysite.com/install/?action=compile_languages
The above tweaks will help you solve this problem.