I have just paid for the virtuemart plugin "ext_joomsef31_virtuemart" to work with JoomSEF v3.2.1.

I have Joomla Version 1.5.8 and VirtueMart 1.1.2 .

All was installed fine BUT when you add a virtuemart product to the cart and then go to the checkout it redirects you to the shop page. It doesnt empty the cart but there is no way of completing the sale.

I dont have HTTPS working on this site and have the config settings set to just http.

If i "skip" the virtuemart in the artio settings, the cart works perfectly so the proble must be with the plugin.

Can you please help me solve it?

Please, read:
Why doesn't Checkout button in VirtueMart work?

The check out button in virtuemart DOES work, but with this sef plugin for virtuemart that i purchased it seems to redirect rather than go to the check out. As i said before, if i disable the sef plugin, virtuemart works perfectly.
Any ideas would be welcome.

so you do have QUERY_STRING set to YES in JoomSEF configuration then?

Excellent!!!
You hit the nail on the head there...thanks for all your help. It now works perfectly.