The Microsoft Exchange Team Blog has released guidance for some of the most common Standby Continuous Replication issues.  It discusses the following issues:

• Enable-StorageGroupCopyStatus -StandbyMachine reports error “Another standby continuous replication source is already configured…”
• SCR Target Log Files Fail to Truncate After the TruncationLagTime is Surpassed
• SCR does not replicate logs in a disjoint namespace scenario
• Database seeding error: Error returned from an ESE function call (0xc7ff1004), error code (0×0)
• SCR Hidden Network share not created in a Cluster with Event id 2074

Read more here.