MacBook Pro (Retina, 15-inch, Late 2013)
NVIDIA GeForce GT 750M 2048 MB
Broken: Version 2.76 (2.75, 2015-Oct-11)
When drawing a shape with the grease pencil and using the fill option, there is color filling outside the enclosed area.
Exact steps for others to reproduce the error
Choose Grease Pencil->Draw
Draw a bean shape
Increase the opacity of the "fill" option - notice the geometry is filled outside the boundaries of the drawing.