Mainpage.php Cannot Be Display Into Web ! 
Author: Bernhard O.
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MAINPAGE.PHP cannot be displayed on the most browsers ? --> maked it invisible and set a link to a normal underpage called mainpage for working ...
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Hello Bernhard,
Is PHP enabled on your server? What happens when you try to open that page?
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Problem Solved with the UPDATE TO 9.0.6, think was a little bug