Home directory changed, now apache don´t know .php files

[PascalJ]

Hello,

i got a problem with the config of the apache.

Beforehand: I want to use Plesk, only for my customers (domains, websites etc.) and configure my own sites manual.

• I configure 2 of my domains without problems in the "/etc/apache2/sites-available" an use the home directory

  /var/www/DOMAINNAME

  , then i tried if i´m able to use the email configuration of Plesk for this Domains. After this i noticed, that the home directory changed to

  /var/www/vhosts/DOMAINNAME.tld

  but my file in /etc/apache2/sites-available isn´t changed.
  
• So i used the command:

  /usr/local/psa/bin/transvhosts.pl utility --dest-dir /var/www/ ---correct-scripts

  But this was not a solution!
  
• Now i deleted the Domain in Plesk, because i thought this solved it,..... but i was wrong

My Problem now:
When i open my domain, the browser only donwload the index.php from the home directoy a set.

How i fix this???

Best regards,

Pascal

[EDIT]
Debian 7.4
Plesk: 11.5.30