Test script:

from p5 import *

def setup():
	size(500,500)

def draw():
	background(255)
	direction = Vector.random_2D()
	direction.magnitude *=100
	translate(width/2, height/2)
	line((0,0), (direction.x, direction.y))
	
run()

Expected behavior:
The line should point at random directions.

Actual behavior
The line only ever points toward the positive quadrant.

p5 version: 0.3.0a2
Python version: 3.6.2
Operating System: Windows 10