Greetings: I realized that I didn't include my email when I used bashbug to report my issue, so I'm sending a follow-up email so that the maintainers can be in touch.
I browsed the code and tried to fix the issue myself by modifying the "prompt_again()" function to execute PROMPT_COMMAND directly. This didn't work, and I'm still not sure why. Maybe the Chet, et al., can make sense of this. Thanks so much for your help and for maintaining my favorite shell! -- Jason Franklin
