I'have the same problem. I updated Virtuemart and it send me this message : Class 'vmJsApi' not found.
Now, when I try to login the site send me this message : see the pic

Dear Sir

Please use VirtueMart 3.6.10, our template support this version.
We have not test with the latest version of Virtuemart.

Thanks

sure, but I wonder how many bugs my e-commerce has due to this template I paid for? Is it still safe? I don't think.
I think you should upgrade your templates if you want to keep selling them.
Thank you, and I hope you warn me if you update it some day.

Dear mephjl

Yes, it is safe. We will update our template in the future.

Thanks