Try the following. Place your intersense on a table and don't move it. Then run the following script and post the entire output it produces. It will connect to the intersense, print some data, then automatically exit after 5 seconds.
Code:
import viz
import vizact
viz.go()
# Connect to tracker
isense = viz.add('intersense.dle')
tracker = isense.addTracker()
tracker.resetHeading()
# Print yaw every 0.1 seconds
def PrintYaw():
print tracker.getEuler()[0]
vizact.ontimer(0.1,PrintYaw)
# Exit after 5 seconds
vizact.ontimer(5,viz.quit)