iMac 14,1 won't Netboot from Deploy Studio server running OS 10.8
This was eventually resolved.  We discovered that with Mavericks we could not netboot across subnets, which we previously had no issues with, so it seems to be unrelated to Deploy Studio or model.
Also learned that the TFTP protocol change is only relevant during netboot if you get the prohibited sign during boot, which we did not get.