Oh, reported it is, but just becuase it gets reported, doesn't mean it will get fixed. So no-one else yet? This is Max 9 SP1, and has also occured in vanilla max 9.
This has happened to a few of us when skinning in Max 9. Some verts don't get affected by painting or by manually setting their weight via the spinner, and when youlook at them in the weight table their weight is set to -1.#IO on some arbitrary bone. I first ran into this when skinning my Dom War guy (VERY frustrating when…