[Paraview] Calculator not save properly with "save session"

[Robert Ferrell]

When I save a session, if I have a calculator which is taking cell data
and producing cell data, that doesn't get saved properly.  When I reload
the session, the calculator is in PointData mode, and generates an error.

What do I have to add to the session file to get have the calculator get
created for CellData?

thanks,
-robert

PS I'm using ParaView 1.2, and I'm reading in .pvd files.