Bingo...sorta!!!
You're correct about my having changed my doc, and trashing /Users/artie/Library/Autosave Information/com.apple.TextEdit.plist - no other files at that location - got things back to normal, but I was unable recreate my problem, so I'm not sure what, specifically, brought it on.
Sorry for totally forgetting about having changed the doc when I posted.
Thanks for helping me get things back to normal!