We are having the same issue.
Vsphere 5
VSC 4.2.1
Data ONTAP 8.1.3 c-mode.
I can see everything (storage systems, hosts, guests, etc) in the other parts of VSC but I see nothing when I try to add a DS.
We currently have SRM running on 5 volumes (Datastores) between the 2 c-mode clusters and virtual centers we would like to do this simple replication on so I know all licensing etc. is in place.
This could solve a huge issue we are trying to resolve so any help would be appreciated.
Thanks
Andy