TMG 2010 - Double Hop DMZ - Ping Issue

Howdy!

I am setting up a Lync test environment using double hop DMZ. I am using the following for setup:

http://social.technet.microsoft.com/wiki/contents/articles/9808.installing-lync-edge-server-in-double-hop-dmz.aspx

All the servers are VM's on vSphere 5.0. DMZ's are on separate vswitches. 

On the TMG backend (BE),  LAN and DMZ-1, I can ping everything on the LAN and the Edge server NIC. 

From the Edge server, I can ping both NIC's of the TMG backend (towards the LAN).

However, I cannot PING anything on the LAN from the Edge. 

I have added the route correctly on the Edge via CMD, Hosts file updated on Edge, TMG access rules & network per the instruction, PING allowed to the Edge via System Policy and everything rebooted several times.

Any thoughts on what to check?? I am at a loss here.....