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I had a similar issue. It was a button on my controller mapped to Beat Tick that I was not aware of when i upgraded and imported the mapping in...
Numark has the instructions on their site right on the Mixtrack pro page. here's a denet mapping i found...
this might help, in case you haven;t found the tsi file http://www.traktorbible.com/freaks/mappingone.aspx?id=150
I got a Mixtrack pro last week and was ok with VDJ for about 2 days. I couldn't stand the interface and didn't come across a single skin I liked....