[nhaudio]

I have the exact same issue, which, as you said, is kind of a non-issue as my MBox Pro 3 (purchased new in December) works fine. It's just the little 'firmware updating' window every time I boot up, which disappears after a few seconds and then all is well.

I haven't posted or tried to use an ASC as I'm using a Mac Mini (late 2012), which is unsupported, so I don't think I'd get help anyway.

I've read of other people having issues with the latest firmware, so that's probably the culprit. Hopefully there's an update soon, but AVID's customer support system is rather weak so 'm not expecting much for a long time.

My setup: MBox Pro 3 with ProTools 10.3.3 on OSX 10.8.2 (Clean install) on a MacMini (Late 2012) 2.6 GHz i7 with 16 Gigs of RAM.