Why does the DLL function executed by call library node fail when the Vi is re-opened?

Development System
OS: Windows XP
LabVIEW: version 10.0
DLL: Custom
Compiler: Visual C++ 6.0
Function Prototype: __declspec(dllexport) const char * test(void)
We have developed a DLL for use. The DLL compiles cleanly. The DLL includes a function test. The test function validates the functional capabilities of the DLL. I have followed the examples online, and I have used the import shared library tool in LabVIEW. The VIs created use the call library node.
When I create a VI calling the test function from the custom DLL using the call library node the VI executes the DLL function test flawlessly. I close the VI. When I re-open the VI and run it, I get an error code from the DLL. However, if I go to the block diagram and set the path for the DLL in the configure call library node again then the VI executes the DLL function test flawlessly again.
I have to set the path for the DLL in the configure call library node every time I open the VI. The examples I downloaded from the community do not require this. What might the DLL be missing? What am I missing?
Solved!
Go to Solution.

I think it was rather unfair of me to ask for help with my DLL issue without disclosing more detailed information. As a corrective action, I have attached a zipped file. The zipped file contains the entire VC++ 6.0 project for compiling the DLL, the DLL, and the VI I have been using to test it.
###NOTE####
As a prerequisite to compilation and usage of the DLL you'll need to have installed Python 26 on your system.
You may obtain the MSI for correct version of Python from the following location:
http://www.python.org/ftp/python/2.6.6/python-2.6.6.msi
###NOTE###
Thank you very kindly for any assistance offered!
Thanks,
Bill
Attachments:
C_DLL_PYTHON_AND_LABVIEW2010.zip ‏1685 KB

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Why does the DLL function executed by call library node fail when the Vi is re-opened?

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