https://bugs.kde.org/show_bug.cgi?id=402535
--- Comment #8 from genosim...@gmail.com --- And i'm stuck here https://imgur.com/a/6zEhGLa I traced the problem to this function: KisToolFreehandHelper::paint(KisPaintInformation&), which under some circumstances calls paintLine(const KisPaintInformation& from, const KisPaintInformation& to) on line 595 where to.pos() is {NaN, NaN}. This in turn, causes all the other above mentioned symptoms. I also found more reliable way to trigger this one. Create a "box" from perspective assistants as in the video above, then start drawing with brush just outside of the box. This triggers the bug instantly almost always during my testing All of this was done with v4.1.7 tag from git. -- You are receiving this mail because: You are watching all bug changes.