vSphere Data Protection & Nutanix

Hi,
I'm having this issue, wich I seem to be the only one in the world to have.I'm new to the Nutanix world so I apologize in advance for any dumb question I may ask.:-)

We've just deployed a new Nutanix block with 3 nodes running the latest version of everything and using VMware ESXi 5.5 U3b for hypervisor. It is deployed in our vCenter Server as a separate cluster (there are two other cluster running older H/W not Nutanix but all the hosts are on the same 5.5 version)

The problem is with vDP. If the appliance is running in the NTNX cluster then I can't connect to it with the vSphere web client. There's no error message whatsoever, the little clock keeps on ticking. If the appliance is running on one of the older H/W, I can connect to it (like I always did for the past 5 years) But, if I go an modify one of the backup jobs to add a VM running on NTNX, when I try to save the job, the client hangs indefinitely and the job is never saved.

I've been searching blogs, knowledge base, log files for hours trying to find the begining of a clue and it would be too long to list everything I tried here. I know it looks like a vmware issue and not Nutanix but I thought I'd give it a try here. Maybe someone will have an idea or point me in the right direction.

Thanks.