Hello,
Try uninstalling 488.2 driver, then uninstall MAX and then reinstall the 2.1 version for 488.2 from
CurrentGPIB driver versions. Also make sure you are the administrator while you uninstall and reinstall.
I have not seen this problem happen before so I hope uninstalling and reinstalling helps solve this problem.
Please feel free to email me back incase you have further questions.
Good luck and have a great day!
Koninika
National Instruments