Hello, 
I have a last version of joomla 1.5  (1.5.25), the last version of virtuemart, and the last version of joomsef 3.8.3 ( payed version) with the relative artio plugin.
I have a question for you:
When I move, a product  of virtuemart to other category, is normal that the url remains the same?
For example:
- product called "red-bag" , located in the category called "bags" have this url: 
www.mysite.com/bags/red-bag.html
- if I move, the product "red-bag", to other category , called "special bags", 
is normal that the url remains the same: 
www.mysite.com/bags/red-bag.html  ?
Why the link is not transformed to 
www.mysite.com/special-bags/red-bag.html  ? 
Thank you
and sorry for my english
Best regards