reposting - hoping for help

We have PXE working on the campus where our ZEN server is located but not
across the WAN. The PC will successfully grab an I/P address but then fails
at the

Auto-select:
ZENworks Preboot Boot
BD.\

This screen eventually changes to

Auto-select:
ZENworks Preboot Boot
UD.\

We've checked and re-checked the routers to ensure that they are
forwarding the correct ports and that the IP helper is there. Has anyone
seen this? Any ideas?

BTW we are using ZENWorks 6.5 in a Microsoft Env. with a middle tier
server (not that much of that matters here) We are using only Cisco routers
and switches.

Question: In a network trace on the workstation side, do you see the DHCP
responce from the PDHCP server?

Answer: Yes we do.

Question: Do you have 2 helpers configured?

Answer: Yes

ALL INPUT IS APPRECIATED!!!