I recently upgraded both my machine and Logic to OS 10.10 and Logic Pro X. I was previously on Logic Pro 9 with an 8 year old Mac. I have an older (5-7 years) M-audio Keystation 49e that I use to play software instruments. It worked fine, but not after the upgrade. I can use it for a few notes, then Logoc seems to quit recognizing it and I get nothing. If I turn it off then on this starts over.