Can't create articles and categories

[Turtle0_0]

Hy,

I have a problem in the admin pane.

 

I can't create articles or categories but I can delete them.

Every action is running over the categories.php file but when I click "Preview" (action=new_product_preview) I get an webserver error (500).

So I can't create new articles and I can't edit articles because both use the "action=new_product_preview" action.

Something in the categories.php file wont work on my server (Windows Server 2008 with IIS7, php,..)

I haven't changed anything in this file, so maybe I have forgotten to install something on the server?

 

Is anybody here who has an idea for my problem?

 

best regards

Christoph

[Turtle0_0]

no ideas?

[Turtle0_0]

Is anybody here who has an idea ?