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i don't know who designed the auto-eraser function (thanks a million for that?),
but i've noticed the 'eraser' function of the pen doesn't work very well, or at least the screen doesn't update in about 50% of the cases, when i'm working in the top or bottom 2-3cm of the screen.
it's generally after flipping a page that this starts (it works fairly reliably when you first open a file, and also works most of the time after you display and hide the menu buttons bar), but it's somewhat annoying (i'm working in zoomed-in fullscreen mode in the bookmarks iPDF version)
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