PHP has been working and still is working on my old sites so I think php and http config files should be correct.

But yesterday when I tried added a new site it wouldn't work with PHP files - it just gives the user the option to save the file on their harddisk...

I have checked httpd.conf and the VirualHost directives are exact the same as for sites with working PHP ( of course - since I havn't edited them manually - sites are created through Cobalt CP ).

Has this happened to anyone else?

I am using PHP 4.0.6 compiled from source.

Never mind. It is working now. I I had an extra LoadModule in httpd.conf for an old libphp4.so, however I can't for my life understand how some sites could work while others didn't.

Anyway, it is friday and I dont care, now it is working :)