MIDI keyboard by M-Audio not working on Yosemite

I just got a new Macbook Pro, so I'm running Yosemite. My M-Audio mini 32 MIDI keyboard doesn't work in Finale 2014 or Sibelius 7. The same keyboard worked fine on my older laptop running 10.8. So frustrating because the M-Audio website claims that the keyboard is "class compliant" and should not require drivers. It should just work, they say.

I haven't even tried Logic Pro, but I'm sure it won't work there either. Sibelius 7 sees the keyboard, but it's not receiving a signal from it. I don't know if Finale sees the keyboard, but it certainly isn't responding to key presses.

If anyone can recommend a solution or a more reputable company that makes MIDI keyboards -- a company that actually keeps the keyboards working with new OSs -- that would be fantastic. It would be one thing if M-Audio would put on their website that they are aware of the problem and are working on a solution. But they don't even acknowledge that there is an issue.