I've been using Pro Tools LE 6.4 w/ Mbox on an iBook G4 flawlessly for 2 years. I upgraded from OS X 10.3.9 to 10.4.8. Now when I open Pro Tools is says "Dididesign hardware is in use by another application. (-1133)" It won't open past there. I thought maybe there was an upgrade for 10.4, but I didn't have much luck looking for one online. Any advice would be greatly appreciated! Thanks!