The saga continues. I've got service pack 3 in the Wintel - and Firefox doesn't care, it doesn't work for some sites. Mozilla suggests I try running Opera - it's gonna be supported for at least a few months.
So how'd I work around this issue today when I had to import a file? Easy - download on one machine, into a thumb drive, then remove drive, turn the chair 90 degrees, and plug said same thumb drive into the other. PITA but it worked. Thanks, kiddos.