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Another bug to add: I have an application where I need to load the serial driver (SERIAL.DW6) in the AUTOST file, rather than using the drop-down GUI. The driver appears to no longer work properly with Keysight IO Libraries 2019 (Suite 18_1_24715) and Windows 10.

When the driver is loaded, ISC for the HTBasic serial driver is ‘9’. The problem is that if the Logical Unit in IO Libraries is set to something else, it appears that the serial driver is no longer able to detect/set up the ISC to the new LU change in IO Libraries, and the ISC remains at ‘9’.