This might happen either when you upgrade from a 9.x to 10.x or when the 9.x and 10.x servers co-exist in the same server group.
The only thing that you can try right now is to invidualise the servers as per their product version, that is ,a different server group for 9.x servers and clients and a different server group for 10.x servers and clients.
Please keep us updated about the status.