I'm running v1.5.5f. Added the FEC plugin. When customer uses the guest checkout option, they receive an error that instructs them to refresh and they get the same error. Each time, the charge is registered through Paypal and they are charged however the order never makes it through to admin. The plugin installed smoothly and everything appears to work properly except this aspect. I disable the checkout without creating an account and all is well sans the easy checkout. Curious if this is unique to me or if others have had the issue? Thanks!