But it only happens sometimes....
I think it has to do with the order the things were drawn.
Paint Beta 2 Bug
Vector image -- Multi shape-select
In RW Paint Beta 2, make a vector layer with two or more objects, try with rectangles, and try to select them all at once with shift-click or CTRL-click (the only two ways I know to do it). The colors change. Weird bug, or is it somehow supposed to happen?