Error in the creationg of new products after update

[naoko15]

Hello, i am having trouble creating new products after upgrading from VM 2.06b to VM 2.6. I can create new products in admin, but product details page and quick view results in a 'page not found' error

All other products work ok. I'm using Joomla 2.5.

Regards.

[naoko15]

I have tried disabling Virtuemart's SEO feature and it results in the new product details page working again : / i can't disable VM's SEO, obviously.  How can i fix this?