0.84 beta 2
In the Draw tool, when drawing arrows and then reducing opacity, the opacity of the arrow changes but not of the fill of the arrow.
0.84b2: Draw Tool: Opacity doesn't affect fill of arrows
Moderators: helmut, XnTriq, xnview
Re: 0.84b2: Draw Tool: Opacity doesn't affect fill of arrows
The problem affects the fill of all shapes: Opacity is applied to outline but not to fill. 

Re: 0.84b2: Draw Tool: Opacity doesn't affect fill of arrows
Fixed in 0.84 beta 3.