Cannot change library path or name when configuring a library call function

Question

I cannot change the library path or name when configuring a library call.  I browse to the new location, click OK.  The new path appears  in the box.  I click OK to dismiss the configuration.  Then I re-open the configuration and the old path has magically appeared.  I wouldn;t care but I get a fatal error whenever I execute the call.  (Another VI with the same call but to a different library works fine.  So I am trying to get the failing call to use the one that works.)

Answer 1

I am using version 7.1
It turns out that everything works fine in LV 2010 but the customer doesn't have that rev.
I am remotely debugging this using GoToMeeting.  Sounds weird, but I fell into that.  It works fine, I have a screen which looks exactly like the screen in the customers site.  I can do everything, albeit with a little time drag.  The thing is, I e-mailed the VI from his site to mine so that I could send it to you.  But it works fine here.  So the question is what could be different there that would cause this?
The main problem that I am trying to solve is that when I run the VI, I get a message
"Labview:  An exception occurred within the external code called by the Call Library Node.  This might have corrupted Labview's memory. Save any work to a new location and restart Labview"
If I set the Library Node on my machine to the correct function, it runs without error.  It seems, however, to start with a different function and then I get the same error.  I would think that if there is a parameter mismatch that the library would return an error status, but this appears not to be the case.  (I did not write the library, HP (Agilent) did)  The function is correct at the customer's machine.