I depend on Notes Plus for all my work and have for years (I teach with an iPad connected to a projector and at the end of class I export my notes to a pdf in a folder I share with my students).
However since the last update it has become unusable. It barely registers strokes and then crashes. See Crash movie, where my hand wirting barely registers and horribly and then after a line or two crash.
This adds to a growing list of bugs that I’ve tried to report to you, but I always get polite platitudes and that you can’t replicate them.