There seems to be a bug introduced in r1396 when making phase objects with the plot collection. This was tricky to find because it only appears if you remove the build directory (and then run a python setup.py install) in yt-trunk-svn/ as well remove any old .yt files for datasets you're analyzing. However, if you do so, any phase_object plots show up empty for r1396-current. It seems to be the changes in yt/raven/PlotTypes.py even though the profile plots are RavenPlots and not VMPlots. Anyone have any ideas on how a change to VMPlot could carry over to ProfilePlot?
You can use yt-trunk-svn/test/DD0010/moving7_0010 as a test. Here is the script I use for making the phase plot:
from yt.mods import * pf = EnzoStaticOutput('moving7_0010') pc = PlotCollection(pf, [0.5]*3) wb = pf.h.region([0.5]*3, [0.0]*3, [1.0]*3) pc.add_phase_object(wb,['Density','Temperature','CellMassMsun'],weight=None,lazy_reader=True) pc.save('test_phase')