we are encountering a problem on a live website using NOP 4.2 version, configured with One page checkout layout.
Occasionally, before sending the user to the payment gateway page we receive "Payment information is not entered" as JS error in the page (billing and shipment data are correctly filled and there is just one payment method).
Seems that this occurs everytime we restart IIS. The cart is correctly available (clint-side) but in this case the user must reset the cart removing all items and add them again to complete successfully the transaction.
We have alredy added key <system.web> <machineKey validationKey="XX" decryptionKey="XX" validation="SHA1" decryption="AES" /> </system.web> to the web.config, but problem persists.
Any other suggestions?
Thank you for your help,