subdomain with cPanel downloads index.php file

[eluser]Unknown[/eluser]
Hello everyone!

I've got the same problem as here : http://ellislab.com/forums/viewthread/175794/

I've created a subdomain with cPanel.
As you can see here http://db.brasey.ch , the index.php is being downloaded by the web browser instead of loading html.
I checked the answer in the other thread. Directories have already 755 and files 644 permission.
Last important thing : a simple index.html file works fine.

Thanks for helping.

Pierre