We just upgraded our installation from 5.0.2 to 5.0.3 using the incremental update. When we logged in we did not get redirected to an upgrade script, though not sure if we should have or not. Using "Check for Updates" under the help menu shows we are up-to-date.
The problem: We have a client that we bill using payment method "Mail in Payment". When we try to manually send them the Invoice Created email (or any other email), we are redirected to a blank page with only the message:
Gateway Module is Missing
The exact same operation worked without issue before the upgrade. We have not made any other changes to our settings on our system.
I am thinking something in this new version requires a tweak, but I cannot any information anywhere.
Does any one have a suggestion on how I can trouble shoot this?
Many thanks.