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opening multiple handles to an instrument causes crash

Running into all sorts of problems lately. The most recent one is this:

When a DLL in our applications has opened and closed a handle to an instrument twice, we get an access violation error from the NI DLLs open exit, more specifically from NiVVgl.dll. If we only open and close the instrument once, we do not encounter a problem. I almost swear that I saw this question on the boards a few days ago, but I can't find it agaion.

Any help is much appreicated.
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