If you look in the device manager you might find multiple instances of the driver under the ACER device. Deleting all of the "greyed out" (ghost) ones may resolve the problem. Otherwise deleting them all and then connecting the device should work. If not, delete the device under Portable devices, then connecting your device will clear up the problem.
---------- Post added at 03:02 PM ---------- Previous post was at 02:59 PM ----------
And yes, that update was an unexpected a$$-kicker. It knocked out N5 and N4 too.
Last edited by stevemw; 6th September 2014 at 08:06 PM.