Hi, I'm trying to analyse an older Enzo simulation which writes its output in hdf5 but with files that look like: GT_RotFrame_128AMR8_stars_0200.grid.cpu0029 the script runs fine until it reaches pc.save(fn), then I get: AttributeError Traceback (most recent call last) /home/taskere/yt/src/yt-hg/scripts/iyt in <module>() ----> 1 2 3 4 5 /home/taskere/yt/src/yt-hg/scripts/iyt in <module>() 55 56 ---> 57 pc.save(fn) 58 59 /home/taskere/yt/src/yt-hg/yt/visualization/plot_collection.pyc in save(self, basename, format, override, force_save) 155 for plot in self.plots: 156 fn.append(plot.save_image(basename, format=format, --> 157 override=override, force_save=force_save)) 158 mylog.info("Saved %s", fn[-1]) 159 if ytcfg.getboolean("yt", "__withinreason"): /home/taskere/yt/src/yt-hg/yt/visualization/plot_types.pyc in save_image(self, prefix, format, override, force_save, figure_canvas) 106 prefix. 107 """ --> 108 self._redraw_image() 109 if not override: 110 self._generate_prefix(prefix) /home/taskere/yt/src/yt-hg/yt/visualization/plot_types.pyc in _redraw_image(self, *args) 399 self.norm.autoscale(na.array((newmin,newmax), dtype='float64')) 400 self._reset_image_parameters() --> 401 self._run_callbacks() 402 403 def _reset_image_parameters(self): /home/taskere/yt/src/yt-hg/yt/visualization/plot_types.pyc in _run_callbacks(self) 256 self._axes.texts = [] 257 for cb in self._callbacks: --> 258 cb(self) 259 260 def set_label(self, label): /home/taskere/yt/src/yt-hg/yt/visualization/plot_modifications.pyc in __call__(self, plot) 83 yv = "%s-velocity" % (y_names[plot.data.axis]) 84 qcb = QuiverCallback(xv, yv, self.factor, scale=self.scale, scale_units=self.scale_units) ---> 85 return qcb(plot) 86 87 class MagFieldCallback(PlotCallback): /home/taskere/yt/src/yt-hg/yt/visualization/plot_modifications.pyc in __call__(self, plot) 148 X = na.mgrid[0:plot.image._A.shape[0]-1:nx*1j]# + 0.5*factor 149 Y = na.mgrid[0:plot.image._A.shape[1]-1:ny*1j]# + 0.5*factor --> 150 plot._axes.quiver(X,Y, pixX, pixY, scale=self.scale, scale_units=self.scale_units) 151 plot._axes.set_xlim(xx0,xx1) 152 plot._axes.set_ylim(yy0,yy1) /home/taskere/yt/lib/python2.6/site-packages/matplotlib/axes.pyc in quiver(self, *args, **kw) 5873 def quiver(self, *args, **kw): 5874 if not self._hold: self.cla() -> 5875 q = mquiver.Quiver(self, *args, **kw) 5876 self.add_collection(q, False) 5877 self.update_datalim(q.XY) /home/taskere/yt/lib/python2.6/site-packages/matplotlib/quiver.pyc in __init__(self, ax, *args, **kw) 392 transOffset=ax.transData, 393 closed=False, --> 394 **kw) 395 self.polykw = kw 396 self.set_UVC(U, V, C) /home/taskere/yt/lib/python2.6/site-packages/matplotlib/collections.pyc in __init__(self, verts, sizes, closed, **kwargs) 664 %(Collection)s 665 """ --> 666 Collection.__init__(self,**kwargs) 667 self._sizes = sizes 668 self.set_verts(verts, closed) /home/taskere/yt/lib/python2.6/site-packages/matplotlib/collections.pyc in __init__(self, edgecolors, facecolors, linewidths, linestyles, antialiaseds, offsets, transOffset, norm, cmap, pickradius, urls, **kwargs) 106 107 self._pickradius = pickradius --> 108 self.update(kwargs) 109 110 /home/taskere/yt/lib/python2.6/site-packages/matplotlib/artist.pyc in update(self, props) 624 func = getattr(self, 'set_'+k, None) 625 if func is None or not callable(func): --> 626 raise AttributeError('Unknown property %s'%k) 627 func(v) 628 changed = True AttributeError: Unknown property scale_units Is there an easy fix for this? If it helps, an example data set is at: http://www.physics.mcmaster.ca/~taskere/GT_RotFrame_128AMR8_stars_0200.tar.g... (about 650 Mb) and the yt script: http://paste.yt-project.org/show/1816/ Elizabeth