Why can I not access this file from within Wordpress? I keep getting a "Forbidden error"!

Hi al,

I installed the WP-Filebase plugin in my wordpress installation. It works perfectly in the frontend and also in the plugin's main page (by clicking the plugin button in the left menu of wordpress) where I can upload files without any problem. But it breaks when I try to import the created sets in pages or posts. In the popup I see the contents of the attached file. Forbidden error
The CHMOD setup of the folder is the second screenshot. CHMOD permissions
I saw someone suggest this on another forum so I tried it: there is a .htaccess file at the moment in the plugins folder where the file in question is and its contents are:
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off

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For your information it is a Ubuntu 14.04 x46 VPS with PHP 5.5.9-1ubuntu4.3 (cli) running on Apache/2.4.7 with MySql 5.5.3. Could anyone tell me what is wrong where and how to go about fixing it?
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badwolfffAuthor Commented:
By the way I tried to access the same page using the full URL in a separate tab and it works.
The URL was something like:

So it works on its own but not inside a popup. What could it be?
Hotlinking is NOT off on my site at the moment.
badwolfffAuthor Commented:
I sorted it out myself. The popup was calling http://mysite.com
I downloaded the database and changed every instance of http://mysite.com with http://www.mysite.com and it all works now! :)

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badwolfffAuthor Commented:
I sorted the problem out myself
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