Can no longer use CTRL+Left/Right in Bash Terminal

Open ~/.inputrc file and add the following lines:

# mappings for Ctrl-left-arrow and Ctrl-right-arrow for word moving
"\e[1;5C": forward-word
"\e[1;5D": backward-word

Close and reopen shell.Now you should be able to use those keys.

Reasons for this behavior ? Not quite certain. For some reason or the other your bash stopped reading /etc/inputrc file, but it should be reading the one in your home folder