Steps to reproduce:
1. Create an empty project.
2. Add two Cube objects.
3. Select one of two cubes.
4. Press and hold 'V' to enable vertex snapping and try to select cube vertexes

Results: It's almost impossible to select vertexes on the right side of the cube. Also it takes enormous mouse movements to snapp this cube to another cube's vertexes.

Repro video: https://www.youtube.com/watch?v=vgQbcQ6rR30

Note: this is not reproducible on all OSX machines(more info description).

Reproducible with: 5.4.0b20; 5.4.0b12
Not reproducible with: 5.3.5p1; 5.2.4f1