[One Man Jury]

I have an IMac, OSX 10.8.4. When I upgraded to ProTools 10, I bought an MBox Pro for an interface and it worked. About a month ago it stopped recognizing the MBox interface. I upgraded to Pro Tools 10.3.7, did a clean install for Pro Tools, uninstalled my MBox Pro driver and then installed Mbox Pro driver 1.2.2 and still nothing. I called Avid support and waited 45 minutes to get a tech person, who said he would get a tech person to call me back, and told me a "clean uninstall" and reinstall should do it. It didn't. A tech person did not call me back. I have about the best hardware you can get, with extra RAM, screaming fast and maximum memory and a 1 terabyte external drive, and I still get stopped about every 4-5 months with software glitches from ProTools. I get an error message when ProTools boots up now. Can anybody help?