Error "pure virtual function call"

Hi,

Windows7, PCI-GPIB, NI-488.2 Version 3.1.1, Visual Studio 2010 C++ Application.

Randomly between 10 minuntes and 4 hours I get the error "pure virtual function call"

With the debbuger attached to the process in error I identified NI4882.dll as the source of the error.

Then I deinstalled NI-488.2 Version 3.1.1 and installed NI488.2 July 2000. Then my application runs without any error!

I triedto attach thesourcefiles which represents the interface between my application and the NI-4882 driver but it did not work for the C++ file.

Any help appreciated.

Best Regards

Walter