HF6 Broke DS Initial Deployment

I recently upgraded from HF5 to HF6 and since then I can no longer boot to WinPE. The client machine sits at the Symanted TFTP boot screen and goes nowhere.

I've rebuilt the automation folders, I've checked all the inital deployment and NBS server settings, restarted etc. No luck.

I've oppened a support ticket but I was curious if anyone else is having this issue.