Hi,
I could not reproduce this bug using VC 6.0. Make sure you are linking to cvirt.lib, in the extlib directory of cvi.
I created the VC project manually. If you created the VC project using the Measurement Studio Project Wizard, then you should see cvirt.lib in the link tab of the VC project settings dialog. If you do not see this library file, and instead see cvi_lvrt.lib or instrsup.lib, then replace cvi_lvrt.lib or instrsup.lib with cvirt.lib, and rebuild the project.
Best regards,
Mohan,
CVI