Installed 857. It works fine except: I am still having trouble with "bad usb". When it is enabled, my usb keyboard does not work. I cannot type any characters in an entry box on the screen. If disable "bad usb" I can immediatey use the keyboard agin. I have been having this issue for quite some time. I figured it would be fixed eventually, but hasn't been todate. Anyone else having this issue? I am using a switcher to connect several computers to 2 monitiors.