Just downloaded and installed MarketPress Lit 2.9.2 using it on a fresh WordPress install (3.8.1) with no other plugins activated.
When I add a product to the cart, it gets added to the cart in the sidebar widget.
If I add a second product, the first is removed from the cart.
If I click on Checkout, the product is removed.
Same thing happens if I am on the main products page, or an individual product page. No matter how I do it, anytime I use Add to Cart, nothing actually gets added.
If I remove the "Add to Cart" option and just use "Buy Now" everything works fine.
If I use IE Add to Cart does nothing but spin.
I have tested all MarketPress settings, turning things on and off. I have deactivated, reactivated, uninstalled and reinstalled.
What am I missing?
See video here: http://screencast.com/t/rIXAwJ85