I think so... web1:client1 right?
It's the same as it is when the default files are created.
-rwxr-xr-- 1 web1 client1 1865 Aug 19 21:54 index.php
note, when it's index.php it's a 500 error (even if no php resides in the file) but if it's index.html, it works fine.
It sounds like it can't contact suphp or something.