vDesigner causes Add to cart button to disappear?

After adding the custom field - Product Category view page "add to cart" does not show.
On this page pilot-sandbox.cloudtestserver.com/writin...ment/ball-point-pens
Product title: Downforce and Camo have custom vDesigner field set, the other do not. The others show add to cart. After removing the custom field I get my buttons back. Is loading Jquery, Mootools or some other conflict? thanks

Hello Peter,
vDesigner can not be displayed on a list layout. It works on detail layout only. We have launched a new version of vDesigner. Please download it from my Orders section, link is given at top right corner.

Solved - Joomla disables add to cart buttons on category layout if custom field is set.