Hi again Logan,
after the problem starts to work, try
./postproc.py output/r_omega1/square_circ_*.vtk -l
./postproc.py output/r_omega1/square_circ_*.vtk -b --ranges=t,0,2.9
to see the results. The first line prints the data ranges - that is how
I have found the value 2.9 that is in the second line.
The latest ETS (mayavi) 3.3.0 is required though...
r.