[pianistslogic]

I can second Harry777's remark about the page going out of bounds when zooming out, sometimes, and it's hard to replicate.

I haven't had annotations disappear completely, but on a number of sheets some of my annotations turned white (on a white background) and merely showed a faint semi-opaque stroke around the actual strokes. My solution was to redraw the annotations and erase the old ones, but it was quirky indeed.