A strange behaviour happened a few times. I explain:
I was drawing with pencil tool (I don't think the tool makes the difference) in a zoomed and rotated canvas.
I needed to pan the canvas to show an out-of-screen area of the drawing but... Both with the move tool or the space-key + pen drag happened that when I touched the tablet with the pen to start panning, the drawing disappeared, like there were applied an enormous drag, but I just touched the tabled surface.
This behaviour keeps appearing until I reset the canvas rotation. After this operation all went ok. This behaviour happened sometimes, like some specific canvas rotations can distort the pan function. Nothing on the drawing was lost, just an erroneous pan is performed.
Thanks for your attention... Umberto