The issue I'm having appears to be related to Magento<->Paypal communication.
I have configured Paypal Website Standard payment method and can successfully "Check out with paypal" upon adding a single product to my cart, I'm quite sure this is the paypal-express method. If I add a second product to the cart and select "Check out with paypal" I'm redirected back to the cart.
If i select the Magento "Proceed to checkout" function, after selecting paypal as the payment method I am also redirected back to the cart.
I've turned logging on, however I'm not getting any additional entries in the exception.log after I corrected an intial IPN issue that I had.
Any thoughts or places I could start to look to resolve the issue?