OK, I just checked - as of last month, the sneaky bastards put out driver 6.0.0. I did not know that. I'll be updating my links shortly. I have them Downloaded now.
Have you tried reverting to 5.9.0 and seeing if it works through that? Although that in and of itself should not make or break adb from seeing your phone....
I'd also try doing a cold reboot on the computer. And check and see if you have a firewall that might be blocking adb from getting access to the phone....