I am using TT7 for a virtuemart3 Template. When I now create products with multi variants and test around with a few selections, the site title suddenly says "404 The requested product does not exist" and the selections don't have any further effect on the product configuration. The URL also doesn't use the product alias any more.
I tested it with the beez3 template from joomla and there it worked fine, so it must be a template problem. Any ideas?