A colleague of mine had a similar issue with his configuration. I think we ended up solving the issue by removing WDS (un-check option on your DP to respond to PXE), renaming the RemoteInstall directory (RemoteInstall.old), *edit* re-enable PXE support on the DP, and then re-creating his boot images (he had MDT integration, so we used that). We did this for both x32 and x64 boot images.