Description
Block 'Category Info' was not parsed correctly on Products Details Page, now it is. Also note, category description will show up only if you access product by link with category_id tag otherwise system wouldn't know what category description to show.
 
Solution
Download the updated version of the file:
http://www.viart.com/downloads/block_category_description-4.0.7.zip
 
Further, extract the 'block_category_description.php' into 'blocks' folder of your shop replacing an existing file. Please do not forget to make a backup copy of the current file in case something goes wrong.