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NLPTR can not optimize function on 64bit SAS

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NLPTR can not optimize function on 64bit SAS

I have been running a SAS script for some time using an NLPTR call to optimize a function. I've used a variety of data within this routine, and I've never had a problem or error. This was always on 32-bit SAS 9.2. Recently we acquired a 64-bit system with 64-bit SAS (9.2 also). When I run the same code with the same data on this new system, I get the following:

ERROR: TRUREG Optimization cannot be completed.
WARNING: Optimization routine cannot improve the function value.

Can anyone explain this or has anyone similarly experienced different optimization results on 32 vs 64 bit systems? Thanks!
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