Unfortunately not, its all rather baffling.
The 'Continue Shopping' option appears when:
1/ There are no products in the cart
2/ You add a product and you go straight to the cart.
The 'Continue Shopping' option isn't there when:
1/ You add a product, continue shopping and then return to the cart at a later date.
Any idea what the issue maybe? Any sort of input would be greatly appreciated as this is a bit of a frustrating one.