  Nonlinear transport in the low temperature vortex glass state of single
crystal Bi_{2}Sr_{2}CaCu_{2}O_{8} has been investigated over long times (up to
two weeks) with fast current pulses driven along the ab plane. It is found that
at low temperature and high magnetic field both zero field cooled (ZFC) and
field cooled (FC) samples relax towards the same equilibrium state, which is
much closer to the original ZFC state than to the FC state. The implication of
this FC metastability for the vortex phase diagram is discussed in the context
of previous measurements.
