I installed 4.17 and after that have only sporadic contact with the JTAGICE Mk.II. This is on 2 PC's.
Checking the Windows hardware list it has found Jungo->JTAGICE mkII. Ver 10.0.1.0 Also under Jungo is Windriver Ver 10.0.1.0
The JTAG II does work through serial port. It also works through USB on another machine with earlier version of Studio4. But have to be "firmware downgraded" to do so. So I'm pretty confident the JTAGICE is OK. Same goes for the USB ports in the PC's as they happily drives a ProfiCore unit on any USB port.
I have 180 AVR's to program this week. I don't understand that I could be so stupid to upgrade Studio4 when I really need it, but I did.