Since it doesn't seem to be accessible to AMS it looks like it doesn't work at all. From there it's hard to find any suggestions (other than "check/reinstall your driver") without some more insight (OSX version, installed driver version, did that work before or is the interface new in your system, when did it stop working after doing what...). Did you try changing the USB port/the interface on another computer (to make sure it's not fried or something)?
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