We have a problem with Veeam6 replication, after upgrading the source vCenter & hosts (live site) from VMware/VSphere4 to VMware/VSphere 5.0 update1.
In this live site we have a dedicated virtual Veeam Backup & Replication server + proxy on Windows 2008R2.
The target (dr site) vCenter/host is still on VMware/VSphere 4.1, with also a virtual Veeam proxy server overthere on Windows2008R2.
The replication jobs from live to DR site start failing now with the message 'Processing configuration Error : Unable to get summary form vm', see screenshot:

In the target site vCenter, I see after a failed replica job an italic-greyed out vm stating "vmname_replica (invalid)"
I removed existing replica's, replica jobs, metadata in the repository, etc... and tried again, no solution.
I also removed and re-entered the upgraded source vCenter server in Veeam B&R.
Anyone has an idea or solution about this behaviour?