So I just bought the 13" basic macbook pro from amazon towards the end of nov. Gave it to my gf as an early xmas present (so she could use it for finals) and everything has been great with it so far. Until last night I get a call stating the trackpad isn't recognizing the two finger swipe left/right anymore. everything else works fine however but the gesture to go back and forth between previous pages is no longer working. any suggestions?