I ran into this a while ago... I'm not sure why I haven't posted it already. My issue looks like this:
Check out the part of the wall that is in shadow. No bump map.
Same view, Rendered with PM:
WallyR was working on his raytracer mods at the time and said that he was able to:
fix this problem. It's literally just a one word change in the code.
So, this has been around:
Don't know where it is any more specifically than that.