HI,
Open this PHP file:
\plugins\system\vm2_cart\vm2_cart.php
and include this line to the top:
I don't understand your second inquiry. I tested the add to cart button in our DEMO:
demo.flexiblewebdesign.com/asymmetric
Everything works as expected. Please be more specific about it, i might not understand what you are actually saying.
Regards,
Support.