So the only thing I have noticed so far this release is when I first render a scene stuff will be out of place, but hitting rebuild scene fixes it. I don't know how this would affect people doing animations.
I have noticed this too. In previous plug-in versions this usually affects items that are parented or those that are parents themselves. In the latest one (R18.104.22.168.9) this seems to happen to random objects or figures in the scene, whether they are parented/parents or not. For me it occurs only when loading an existing scene though. But like Sorel says, hitting rebuild will fix it.