NetWare 6.5 sp5 and all post sp5 fixes through july 5th.
ZDM 7, sp1

Workstations are WinXP sp2. All workstations have their workstation names
set in ZIS data area.

If I reimage the lab of 21 machines using multicast, about 7 of them won't
rename themselves. There doesn't seem to be a pattern as to which ones do
and don't. Unfortunately I don't have the time to test those by doing a
one-on-one image.