Hi,
We're coming across rare occurrences of this error in one page checkout:
Payment method is not selected
System.Exception: Payment method is not selected at Nop.Web.Controllers.CheckoutController.OpcSavePaymentInfo(FormCollection form)
A customer said that they filled out their credit card details (after selecting CC method) and then received the message above.
Running v2.50. Upgrading is a possibility although this specific bug wasn't mentioned in update release notes.