Thanks -- I'm puzzled, too. I just checked my jar of mixed (1:4) Ilford Rapid Fix that I've been using for several darkroom sessions with a strip of unexposed film, and it cleared in 1 minute, but with a magenta tint. As per Doremus's advice, tomorrow I'm going to print with a batch of fresh as a daisy fixer and see if the staining occurs again.
If the staining keeps reoccurring, perhaps I'll just give up on selenium toning. But I do like the effect it gives to prints.
As I mentioned earlier, I would have never noticed the staining had I not accidentally held a print up to light so that it's backlit. Viewed under normal lighting, the staining is invisible.
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