Virtuemart & SEF Advance

This is strange, but if we turn on SEF Advance with the new Virtuemart Extensions, some links to products pick a product in the wrong category.

They have the same name like the ones the user click on, but this is in the right category. While the URL looks correct, the breadcrumb and the description shows me that it is not the product the user selected. If I turn off SEF Advance, all works fine...

Any idea? It seems like it picks the first product with that name in the product list.... (I can confirm that if I give the product a unique name, this does not happen. It only happens if there a products with the same name in different categories.)

Configuration:
Joomla! 1.0.12
SEF Advance 5.4.3
VirtueMart 1.0.13a

There is aalso a second problem:

www.charisma-art.com/art_store/original_art/
If you click on the Baaasketball - Original Oil Painting, it redirects to a category....

Peter