A strange hang

I am using Visual C++ .NET 2003. The code takes up approximately 600K
of disk space (so you have any idea of the size). First, I compiled,
builded, and executed this program using exclusively floats for all
precision computing. However, I realized for my application that more
precision was necessary; therefore, all the float instances were changed
to double. The program has no trouble compiling and linking, however
when executing it hangs with the error: System.NullReferenceException
(debug mode).
It ran perfectly before changing from float to double. This was the only
change made; the only other changes were casts from double to float
used when absolutely necessary. Also, there is something strange: When
adding and removing more global identifiers (which do absolutely
nothing), the program seems to freeze at different execution points, so
it seems unlikely that there is a failed reference; but I could be wrong.
Does anyone see what the problem is right away? Sounds like some sort of
memory corruption, perhaps? A loading problem? The heap?
Does anyone have any idea what this could be? I'll try anything at this
point!
Thanks in advance!!

Hi Terrence,
Are you using any components of Measurement Studio?  Can you isolate this error to a particular line of code?  This is on the development computer, right?
If you are not using any Measurement Studio components, you may want to also post on a .NET forum.  Here is some additional information about this error:
http://msdn2.microsoft.com/en-us/library/system.nu​llreferenceexception(VS.71).aspx
http://codebetter.com/blogs/raymond.lewallen/archi​ve/2005/06/23/65033.aspx
Cheers,
David Goldberg
National Instruments
Software R&D

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