Glad to hear you aren't having any issues so it just seems to have been a quirk with my particular unit. It actually makes me a little more uneasy if it is just my unit since another firmware update likely wouldn't have fixed the problem. It is sheer dumb luck it seems that the solution I tried worked. If I had simply stuck with firmware 2.2 and not gone back to 2.3 I might not have been able to use my M0 with my computer again. Here is hoping that Shanling's next firmware update will be the last one needed for the M0!