Thanks scud,
I've used the settings you indicated, and (so far) I've not seen another instance of my upload capability being crippled. I'll keep an eye on it, but it appears that this problem is under control.
Thanks 4558073,
My interpretations of "uploads per person" and "simultaneous uploads" may well have been bogus. I guess I've been spoiled by applications that at least warn me before allowing me to set contradictory parameters.
It's curious though that I did observe a brief instance with the new settings where there were two uploads taking place where I would expect to have seen only one. Could this be a trick of timing where the window doesn't update as fast as real events?