Whew!!
After updating Calibre and properly mounting my eDGe (which I didn't do previously, being in a panic . . .), all is right with this part of the world. Calibre recognizes my eDGe just as it should.
Which means, I suppose, that if it still doesn't recognize yours, it could be an Ermine/Froyo problem after all. Here's hoping it's a quick fix!
Now running Calibre 0.7.54