Mixtrack Pro 3 not recognized in Serato DJ

i played with my mixtrack pro 3 in serato dj intro for quite some time now. after being satisfied with my ability, i chose to step up and pay for serato dj. now when i open serato dj it opens in the default screen, not the screen with two channels like as serato intro does when it recognizes my mixtrack pro 3. i have disconnected, reconnected, rebooted and rebooted and rebooted and nothing. please help!!
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