Communication with Keithley 2700 using NI GPIB-USB-HS

I've been recently experiencing an issue running an older labview (v8.2) program with a NI GPIB-USB-HS to control a Keithley 2700.

the program controls other instruments as well on a gpib bus. for unknown (to me) reasons, the program uses an ivi session and dll function calls for only the 2700, but direct gpib communication functions for all other instruments

-the program seems to work fine without any issues on older machines using pci gpib
-however, apparently no communication with the Keithley 2700 - good communication with other instruments- on a newer windows10 machine using the GPIB-USB-HS;
I can, however, see the instrument there and query/read from it within max
would anyone know of a solution for this?

best regards,