My org is new and was activated (from a trial org a week ago). Most of the code in production was written when the org was still in Trial. Production test coverage is 79%.
I'm trying to deploy a change set from the sandbox, with 83% coverage. In Production, deployment validation fails because of 63% coverage but there is no error or exception in the deployment log.
This org had a related issue a couple of days ago, where the change sets where not visible in Production (root cause was the NA3 split).