When you visit the domain: http://www.luftwaffe-experten.org/ - there is a script downloaded, but why is this occurring? It should load a forum (/forums/) but never actually opens/loads - why is this occurring?
I've copied the entire site via cpanels WHM account transfer process, but it fails to load - is the PHP I'm running on the server not compatible with IPB 3.4.6?
Just FYI -
The problem was due to .htaccess file.
The old server was Php 4.x the new server is 5.X - so I had to comment out this line: AddHandler application/x-httpd-php5s .php
And the forum loads perfectly now :)