  We report on new data from additional zero temperature simulations of QCD
with 12 flavors. This is a continuation of previous studies using the DBW2
gauge action and naive staggered fermions. With the use of the force gradient
integrator and a multiple-quark-mass preconditioned HMC, we have done
simulations with input quark masses from $m_q=0.003$ to $m_q=0.008$. We have
observed a metastable, first order, bulk transition that occurs at small input
quark masses. As the quark mass increases, this first order bulk transition
ends at a second order critical point, and, for still heavier quark masses,
becomes the cross-over we have previously reported. We present measurements of
hadron masses, decay constants and other low energy observables in the small
quark mass region on the weak coupling side of the bulk transition. Our results
show that the behavior of the system is still consistent with spontaneously
broken chiral symmetry. We also discuss a preliminary investigation into the
behavior of the bulk transition itself. We have found that, as the system
approaches the second order critical end point, the scalar singlet meson
becomes lighter. Thus it appears that the critical endpoint corresponds to a
continuum limit theory only involving scalars and, following known triviality
arguments, this is likely a free field theory. The presence of this critical
endpoint could influence scaling of lattice observables in the conventional
continuum limit.
