Found the problem! See 2nd post, move this thread if needed.
Asked in #blender and was suggested I submit a bug report, but thought I’d check here just in case.
I created a cube, attached a two-bone armature to it with ctrl-p > armature > namegroups. Then I made it into a real modifier. After that I went bone by bone to weight paint a few vertices.
You’ll notice if you open the blend I posted, that one vertex will be light blue, the other will be red, yet the armature is pulling them as if they were both red.
Whats more, I can’t seem to activate its action in the game engine (Yes, start and end say 0 and 0 in the action modifier, change that to 30, you’ll see it’s still no effect ^^;; my mistake for that one). Is there something blatantly obvious that I might have missed, or is this a bug?
weightCube.blend (137 KB)