I have added a new vcenter system to my vmware probe, and I see source (such as esx servers) in the probe UI, but they are not showing up in USM.
Release : Any
Component : UIM - VMWARE
If this is a configuration where the vmware probe has multiple vcenters listed under it, this could be an issue of scaling for the vmware probe. Try moving the vcenter to a vmware probe with no other sources under it, to rule this out.