Updated to Simplify 2.3 | Add to cart button doesnt show on variable products

Launch date for our site is 6-13-14. Everything was done and functioning GREAT! Then I updated wordpress to 3.9.1 and all of a sudden the add to cart button for all my variable products do not show up. So I updated the simplify theme to 2.3 and the buttons appeared but then 30 mins later I come back and the buttons are not showing again for the variable products. Any info would be greatly appreciated!!! I was really enjoying this theme now all of a sudden this happened. Not sure what the problem is