I am experiencing the exact same issue, figured I'd poke around here before submitting a ticket.
I'm on vCenter 6.0 U2/ESXi 6.0 U2 and VDP 6.1.2, all VMs use 9.10.5 VMware Tools on HW Profile 11
If I switch to a Standard Switch things work but on a Distributed Switch the Web Client hangs on connecting, I have found I can create backup jobs against a vSAN datastore but not against a shared storage array. Not sure if local storage works!
Glad to see I'm not alone.