Operating system: W10 v1903 (Build 18362.387)
Graphics card: Nvidia GTX 1070 Max-Q
In a new Blender project this works seamlessly, but in the one I am working on right now I want to create some grass blades. Unfortunately I cannot select any vertices edges or faces that show up in the UV editor. Upon using either grab, relax or pinch, Blender will just close.
Open "UV Editing" tab, select one of the grass meshes, go to edit mode, try to select the vertices. Rest goes as described above.