[Paraview] Inaccurate results with Probe filter

[Tony McDaniel]

I'm using the Probe Location filter to extract data from a 3D CFD 
solution for an internal flow, and I'm not getting the data that I 
should be for some (but not all) of the points. The dataset is 
approximately 7 million nodes saved in Ensight format.

I'm comparing the data returned by Paraview to the data at the same 
locations in FieldView. For licensing reasons, I would prefer to use 
Paraview for this research, but I also need accurate solutions.

For two representative probe locations, I have the following results:
x       y       z       pv_density  fv_density  pv_pressure fv_pressure
0.3912    -0.0376    -0.0566    0.9040      0.9040        67779.9     
67779.9
0.3912    -0.0426    -0.0516    0.8275      0.8623        65849.0     
66176.3

The first point matches precisely between Paraview and FieldView. 
However, the second point is substantially different. In addition, the 
velocity at point two is {0,0,0} indicating that the point is on the 
boundary, though it is not actually.

Looking at color plots in Paraview, the color under the point location 
clearly matches the numbers from FieldView. I've uploaded plots showing 
pressure in the plane containing the two locations here:
https://dl.dropbox.com/u/744216/probe1.png
https://dl.dropbox.com/u/744216/probe2.png

The values are wrong for points that are close to the boundary, and 
match FieldView for points away from the boundary. I have also tried 
importing the locations from a CSV file and using the Resample Dataset 
and get the same values.

Can anyone shed light on why this is happening?