Yup...other VMs on the same vswitch communicate fine with VMs sitting on the DV switch. It has been a puzzler to me. Was thinking of creating a new NIC and setting that up to see if that would fix the issue or maybe even just a reboot of the VM. Unfortunately, the VM in question is very busy and we actually discovered the issue when we migrated another box over to the 5.1 hosts on the DV Switch that depends on communicating with this application VM and discovered it did not work.
MK