Curiouser and curiouser, said Alice.
Don; you seem to have investigated this as far as is possible, so I think now is the time for a referral to support. Your researches have been worthwhile because you now have a far more detailed picture than you had earlier and that ought to make Mark's job much easier in pinpointing the source of the trouble.
Please let us know how turns turn out, including any explanation that is forthcoming.
Chris
