As it turns out with my experiment to use this big jug of stock solution in post #1, I mixed up some at 1:5 last night, and used it to make some contact proofs. The working solution turned out cloudy and fairly stinky. But it DID seem to fix OK, although I have no idea if it's leaving residual silver. It would be a shame to just get rid of it, as I sure do have a lot of it.
If the working solution was cloudy then it is beginning to sulfurize. Nothing can be done to save it and it is best to chuck it. The sulfur that is being formed will stick to film and prints and cannot be removed. Sorry
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.