Memory leak when I use function with bstr_t type

Hello,
I use Visual C++ 6 and TestStand 3.1.
I use the tool: Purify from Rational Instruments to detect memory leak in my code.
When I use in my code, functions from the TestStand API using bstr_t types: GetValString, GetType... memory leaks appear.
Do you have an idea to solve this problem?
Thanks

Breizh,
Etes vous sur que le problèmes soit lié au type bstr_r ?
Pouvez vous me faire parvenir un exemple de code mettant en oeuvre la fuite mémoire?
Raphaël T.
NI FRANCE
Cordialement,
Raphael T

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