M-Audio M-Track Only Playing Out of One Speaker!!

No idea whats going on, but after booting up my Mac Mini 2012 with my M-Audio M-Track plugged straight into the back of the Mac's usb port, I'm only getting sound from one of the speakers (Yamaha hs50). Ive tested the speaker and theres nothing wrong with it. I had this working fine yesterday. I'm on Mavercks 10.9.1
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