I am facing a problem that I think I had in the past as well.
When a client selects a payment method or shipment method that costs money, the amount is not added to the cart.
Unfortunately I am not sure when it stopped working. I am quite sure it worked in VM 2.0.29 and I recently updated to 2.6.10.
What would be a solution?
I have looked into jQuery already. I am using jQuery easy to prevent conflicts since Virtuemart 2.0.4. I now tried numerous option or disabling this plugin, so far no luck.
I am now using VM 2.6.10 and Joomla 2.5.27.
what do you mean by "onepagecheckout" ?
3rd party?
no the option for this in the configuration page.
I would assume your cart template over ride (do u have one?)