index.php show the license instead the forum

[Valerio]

hi there, i don't know what is happen but actually
www.mysite.com/forum that load index.php
before it use to redirect to
www.mysite.com/forum/forum.php

instead now does not redirect but show the vbulletin license
could you please help me?

--------------- Added [DATE]1265470511[/DATE] at [TIME]1265470511[/TIME] ---------------

I solved by overwriting index.php and content.php, now it work but i want to know the reason.
No one touch the integrity of the two files, i mean nobody edited.

Then i would like also to know if the files of the forum are generated dinamically (obviously except the sitemap) or if i need to restore the original files i can copy ANY kind of file from the original package WITHOUT touch settings and content?