Raymond....the first time I looked into the 'mod Q' aka 'private' section...it didn't even show....so I went hunting everywhere...and a specific search then revealed it as 'private'...so I rest the date and made it 'public' yet again.
Chances are that it is STILL the wrong preview...but at least it is visible.
There are 'only' a few specific uploads that this has happened to, and since it is infrequent it is difficult to replicate.
Coders' opinion is that the update issue won't recur with the WC2K7 site....so once that's online subsequent updates will be OK.
I'm crossing my fingers....as, as you know...we [me] have exhausted every other possibility/option....