Hi there,
I am running Joomla 2.5.14 and VM 2.0.22.C
As I haven't find a working solution to this problem with these specs, here is my small contribution to all the help I received.
Please consider I am not a professionnal and this should be validated by senior developper.
But I works pretty fine and looks coherent to me.
This is what I did :
1. Create an override of the virtuemart component in your template
yoursite\templates\yourtemplate\html\com_virtuemart\manufacturer
2. In manufacturer replace the existing line (around line 64) in
yoursite\templates\yourtemplate\html\com_virtuemart\manufacturer\default.php file
$manufacturerURL = JRoute::_('index.php?option=com_virtuemart&view=manufacturer&virtuemart_manufacturer_id=' . $manufacturer->virtuemart_manufacturer_id, FALSE);
with this one
$manufacturerURL = JRoute::_('index.php?option=com_virtuemart&view=category&virtuemart_manufacturer_id=' . $manufacturer->virtuemart_manufacturer_id, FALSE);
Hope this will help and give feedback if it works for you :-)
Best,
Christophe