UPDATE:
Things seem to be working now.
What I did: Changed the theme to the default WP theme (wp_options table, option_id #’s 48 and 49)
This magically allowed the admin area to start working again.
Activated the old theme that was working (not the new one that seems to have caused the error).
Turned the delicious plugin back on
All is well in wordpressville…for now.
The theme was “PlainBox” — it came from a very reliable website…unsure of what happened. I’m going to try to reactive it and see if this happens again.