Thanks for the vote of trust.. (smiling at Tonysara)
I ALWAYS deep scan. My setting is "deep-inspection scan".
I deep scanned immediately after the release of definitions file 310.
Btw, another reason to believe that this is an FP is the variety of machines, OS, and browsers on which this "threat" was detected.
I don't know what else to do to make Tech Support see the light ... (sad)