Description
In the ADS section, if you select to view Description and Specification as TABS there are missing correct styles to display them like on product page.
 
Solution
http://www.viart.com/downloads/block_ads_details-4.2.html.zip
 
Download the file above and extract 'block_ads_details.html' in /templates/user folder of your shop replacing the existing file. Please do not forget to make a backup copy of the current file in case something goes wrong.