Speaking specifically to SFW 5.x...when you say the Secondary was 'mounted,' do you mean that a drive letter was assigned?
If so, remove the drive letter from the Secondary Volume using the VEA File System -> Change Drive Letter and Path...
Give Replication some time to update, then add the drive letter back to the Secondary to verify that the file as been updated.
As Eric said previously, the Secondary Volumes are not meant to be mounted with a drive letter while SFW VVR Replication is running.
Please let us all know if this helps,
Dave