M-Audio device problems after El Capitan update

After my recent upgrade from Yosemite to El Capitan, my M-Audio FastTrack Ultra 8r is not recognised by my MacBook Pro mid-2012.

I work in a recording studio and everything is always set up the same every day, I just plug into the USB hub and get going, no problems. I decided to upgrade to El Capitan and now my audio interface does not work. I have been on the Avid site and downloaded the most recent drivers, restarted a bunch of times, checked all of my cables and routing etc., nothing seems to work. The M-Audio FastTrack software also shows my device as not being connected.

Can anyone help, or does anyone else have the same problem? Thanks in advance!

Josh

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OS X El Capitan Version 10.11
MacBook Pro (13-inch, Mid 2012)
Processor 2.9 GHz Intel Core i7
Memory 8 GB 1600 MHz DDR3