Quote:

Just another small update since Preview and TestPaint would crash when drawing outside the visible canvas. Easily tested by using the Symmetry Tool and drawing f.ex. circles.

So here's:

V1.21 (16.04.2020)
- TestPaint: Display optimizations of V1.2 had an off-by-one bug causing all kinds of crashes when drawing supposedly outside the canvas.

Just redownload the Archive and sorry for the hassle.