Hello, I keep noticing an annoying glitch when operating my pen / inking during a powerpoint presentation. While writing, short horizontal lines randomly appear, eminating from the contact / writing point. I am constantly having to erase / go back, at which point the "errant line" / letter I was just wrting will both dissapear, and I go back at it. I have Widows 7 (retail install) on my computer, but I seem to recall the same proplem in Vista. This glitch does not seem to occur when I'm inking in Word, or even PPoint in eidit mode. It seems to only be a problem in a presentation. Any insight would be greatly appreciated - and I thank you for your time!