It seems related to the zoom window, which I am just figuring out. At full scale, my writing is off by 3/8". If I unpinch to zoom, I get a split window. Above is the full-sized note, with a blue rectangle to depict the zooomed-in area below. In the zoomed-in area, my stylus and the lines I draw line up just fine. Not the case if I close the zoomed window, then my line is off by 3/8" again. Today I noticed something in the zoomed-in mode: the blue rectangle "thumbnail" in the full-size upper portion does not align with what I am seeing or writing below. If I write along the top edge of the lower window, the blue rectangle slides along BELOW my text in the upper window, and the offset appears to be identical, about 3/8" below where I see my text above. This leads me to believe it is, indeed, a software issue.