When I upgrade to the latest version of VirtueMart all products on the category listing disappear.
I was updating VM from 2.0.14 to 2.0.20b. I'm using Joomla 2.5.9, PHP 5.4.14.
I've attached some screen grabs to illustrate what I mean. The site that is working as it should before updating can be viewed at www.fsgtestsite.co.uk/luxlux2013/index.php/products/bed-jackets-capes/. I ran the update test locally.
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Looks like you need to update your template overrides. The changes in VM output are documented in the live update info - hit the update info button, bottom left on the VM admin menu or got direct to http://virtuemart.net/index.php?option=com_content&id=416
You could also look at the images of the code changes in the file virtuemart_2.0.14_to_2.0.16_layout_changes.zip from http://dev.virtuemart.net/projects/virtuemart/files