<sigh>
Well, I took the entire tire off and tried all over again, but no dice.
On top of that, I did an experiment- I took the inner tube out and tried to put the tire on without the inner tube, and it does not go on the rim, no matter how hard I tried. So now I'm confused.
I'm ok. The bike shop opens at 10am, so I'll be heading over there to get them to put the tire on the bike instead. I'm going to get them to show me what they did, in case they're something I'm missing, although I don't think so. Usually, the hardest part of changing the rear tire for me is getting it back on the bike, not getting the tire on the rim!
Thanks anyway.
Koff