Real Time Simulation, problem with the 3D Lookup table

Hello,
I have a problem with LabVIEW RT. I want to read under the parameters of temperature, time and voltage, the current out of a matrix.
The matrices differ only in the temperature (first entry in a matrix).
If the 3D Lookup table only get one matrix, I often get "Not a Number" as result. But not always, although the parameters remain the same.
If the 3D Lookup table gets three or more matrices, the result never be "Not a Number". But the 2 other matrices are "dummys" filled up with zeros, expect the temperature. Also the problem appears only if I start the test sequence as Startup on the RT-System. If I start the test sequence from the Front Panel, the 3D Lookup table works well, whether one or more than three matrices!
Its confusing, I know ^^
The appendices contains pictures from a matrix an from the Block Diagram
Attachments:
Block DIagram.jpg ‏146 KB
Current-Matrix.png ‏27 KB
Dummy-Matrix.png ‏12 KB

Hello salomon,
The 3D lookup table is not generated in my code, but is invoked as a constant. I examine the behavior of electrical loads in the cars. Consumers were in a climate chamber measured at various temperatures and these values were packed into a 3D lookup.
Helps you even further? : D

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