I saw this a while ago when I gave Ax9 a spin. Thought I’d see what’s changed since I did that and the grid when I pan around the screen (space + drag) gets horribly mangled. I uninstalled/reinstalled and still see it even in a brand new, completely empty, never seen a widget on it file.
My setup:
T470p, Win10 version 1607, NVIDIA GeForce 940MX / Intel HD 630, 32gb RAM
Three monitors (2x 2560x1440, 1x 1920x1080); it exhibits the bx on all three of them