It turns out that the Georgia(s) inhabiting my computer are fine, but there was an interloper by the name of Serrif Grunge which for some reason appeared when Georgia Bold was called by the web applications and by TextEdit. Happily, TextEdit revealed this to us, we've trashed Serrif Grunge, and all is right with the world.

So my instinct to identify the font was a good one. Phew. How happy I am to have a Beast about the place who is able to poke around in the system folder without fear.