Hi,
There is no problem in your website, the link opens the "Manufacturer" page, where there was supposed to be manufacturer details, the logo and the link to list all products from that manufacturer. But apparently you have changed that manufacturer page little bit, this is why you are seeing a blank page.
But the patch that will work for you has been provided here:
www.flexiblewebdesign.com/forum-virtuemart-2-template-puremart-support/1551-manufacturer-logo-on-product-page-link-to-catgory#7269
Basically the link for the manufacturer image should be replaced from:
href="<?php echo $ManufacturerLink ?>"
to this:
href="<?php echo JRoute::_('index.php?option=com_virtuemart&view=category&virtuemart_manufacturer_id=' . $this->product->virtuemart_manufacturer_id); ?>"
In the product details PHP file.
So the link will open the "Category" page and list the products from that certain manufacturer. This will bypass the manufacturer page and list the products directly in the category page.
Regards.
Support