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Why do I get an assertion violation when I port my 32-bit FORTRAN MEX source to a 64-bit MATLAB 7.6 (R2008a) ?

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I have an existing FORTRAN MEX source code which compiles and works fine on a 32-bit MATLAB. This source also compiles fine on 64-bit MATLAB, but it fails when I try to run it.

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MathWorks Support Team
Some legacy FORTRAN code use the following syntax to define the MEXFUNCTION:
SUBROUTINE MEXFUNCTION(NLHS, PLHS, NRHS, PRHS)
INTEGER PLHS(*), PRHS(*)
INTEGER NLHS, NRHS
This might compile and execute on a 32-bit platform, however, the recommended syntax is to use MWPOINTER as shown below (for any platform).
This is essential for the MEX file to execute successfully on a 64-bit platform.
SUBROUTINE MEXFUNCTION(NLHS, PLHS, NRHS, PRHS)
MWPOINTER PLHS(*), PRHS(*)
INTEGER NLHS, NRHS

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