MIDI interface not recognized after Mavericks install

Hi,
I was using a Midisport UNO with OSX 10.6, connecting my keyboard with the Mac Pro and using programs such as Live and Garageband. After the Mavericks install, I have a bunch of obsoleted hardware. I understand that Midisport have not come up with a driver to support Mavericks just yet. But that is not my issue.
Today, I purchased a new MIDI interface, one that is class compliant and so requires no driver software. According to everything that I have read, from external literature to the interface's literature, the device should work just fine. But my Mac Pro doesn't recognize the device in the Audio and MIDI Setup utility. In fact, it recognizes the Midisport UNO just fine but that device is greyed out and I guess this means there is no correct driver.
I have noticed that the Mac Pro seems to turn off ports when supplying power to USB devices. Sometimes, the front USB ports will not connect my iPhone to iTunes, for example. When I restart, the power sometimes returns. So is this a power issue or does my connectivity problem lie with the MIDI interface?
Thank you

I just purchased a new iMac running Mavericks. I have an M-Audio Keystation 49e, I have the same issue. It won't work or be recognized in adui/midi setup. It is there, just greyed out. I have searched everywhere for a fix. All you find is delete this, delete that. It worked fine on Mountain Lion, now it is useless to me. I have tried running it through a hub, doesn't fix the issue. I use power as opposed to just the USB, doesn't fix the issue. Can someone please point us in the right direction so we don't have to go spend more money on a midi keyboard because of Mavericks?

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