Hi all,
Thanks for all your help. Peter, it's good to know the empeg is pretty robust. I was worried when I got it to a state where plugging it in did nothing, but fortunately it was still receptive to receiving and installing another upgrade image in that state!
And yes Boelle, thankfully it is up and running and happy again. My wife is driving to work this very moment with a new batch of tunes.

The 250GB drive should be here early next week, then the real fun begins. This was just a practice run with the existing 30GB drives.
I suspect I will be forced to choose each artist, then apply the wendy filters to all songs in the right pane for that artist. This will require me to apply the wendy filters artist-by-artist instead of just ctrl-selecting a bunch of top-level artists at once, but that's not too bad.
I wish I knew why the regular emplode client crashed when applying wendy filters. Who knows, maybe it works in that client (for other folks!).
I appreciate everyone's help. It's nice to be back!
- Chris