I have a MacAlly USB 7-port hub. It is one of those jobs with the changeable colored shells. I am trying to use this with a Rev A iMac that is running 8.5. If I am in 8.6 or higher, the hub works. Right now, it is unrecognized by 8.5 and I want it to be. What am I missing to make the hub work? What is different in the two versions of 8 that make the difference?