Hey Guys,
Same issue here, couldn't resolve after many attempts. Just found a solution to the issue - try installing the KX V4 driver instead - worked for me. The interface is a little clunky compared to the straight KX driver, but at least it works. Only functionality I lost was the ability to lock down black and white printing, which isn't the end of the world (it can still be set as a default).
Bert SCS & miked - Here's the iteration of your KX V4 driver:
https://usa.kyoceradocumentsolutions.com/content/dam/kdc/kdag/downloads/technical/executables/drivers/kyoceradocumentsolutions/us/en/Kxv4_v5.2.1303.zip
tosh - Here's the iteration of your KX V4 driver:
https://usa.kyoceradocumentsolutions.com/content/dam/kdc/kdag/downloads/technical/executables/drivers/kyoceradocumentsolutions/us/en/Kxv4_v5.2.1303.zip
(Drivers appear to be the same for both models). Hope that helps fix the issue guys, or is at least an interim solution for now.
Cheers!