I have recently updated my iMac to 2.7GHz Intel Core i5 OSX 10.8.4.

Previously I had a 2007 Intel iMac. I had a Tascam US-122 Audio-Midi interface which I used with Logic Pro. When I updated the iMac, the Tascam wouldn't work, so I acquired a newer model, the US-144 mkII. I downloaded and installed the latest drivers and firmware update, which are said to be compatible with this version of OS X.

Previously I had a 2007 Intel iMac. I had a Tascam US-122 Audio-Midi interface which I used with Logic Pro. When I updated the iMac, the Tascam wouldn't work, so I acquired a newer model, the US-144 mkII. I downloaded and installed the latest drivers and firmware update, which are said to be compatible with this version of OS X.

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However it is not working. In the Sound control panel, I'm seeing this:

If you select it, you get no output.

In Applications>Utilities>Audio MIDI Setup I can see the device, but none of the sliders respond:

In the devices control panel, I noticed the following error message:

This device is USB 2.0. Anyone have any ideas of how to trouble-shoot? I will try and ask Tascam but they don't appear to have end-user support, and I bought the unit via mail order, so I can't go back to the retailer. But as it stands, this unit is currently an expensive paperweight.

iMac, OS X Mountain Lion (10.8.4)

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