Support Shortcodes to produce support index site do not work

Hi you sunday co-workers,

on i am trying to set up a support index site after customer logged in successfully. I am using the shortcods to insert the ticket overview, the FAQ section and the "new ticket" shortcode, but none of them produces anything visible exept an thin line, just like a dividing line.

Firstly, I Thought it comes from the Visual Composer, but even if i use standard editor, it does not work. Secondly, i gave the copy and paste from the settings page a shot, instead of using the shortcode generator above the editor, but none of them works. Any ideas on how to get this idea to work is welcome. Thanks a lot!

Have a great sunday, Sebastian.