When you are performing do you here the portamento?
You are in song mode correct? It's possible that the template you are using, on that particular track, has portamento embedded into the output or mix. If you are in song mode, then the first song should probably be Clubworx? Go to song 3 and start a new sequence there and load the instruments you are using into the different tracks and see if it does it.
Also, you don't have local on do you?