bash history search key binding

[Lei Kong <lei.kong@gmail.com>]

Hi all,

I am using debian testing, and the bash version is 3.1.5.
I have the following  lines in my .bashrc to assign arrow keys to 
history search:

bind '"\M-[A":history-search-backward'
bind '"\M-[B":history-search-forward'

It worked well before, one day, after I did a routine upgrade,
it stopped working. The weird thing is, the arrow key search
still works in a sudo shell.

Anyone has a clue on what's wrong?

Many thanks.

Lei