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What could cause the alt key to stop working in two terminal apps?

I use lots of keyboard shortcuts when I'm working with bash in a terminal. Two that I use heavily are Alt-d and Alt-. to delete the following word and to bring in the last argument of the previous command, respectively. Another bash/readline shortcut Ctrl-Alt-e also does nothing. (So basically, Alt doesn't work at all.) In the last twenty-four hours--somewhere in the middle of a marathon coding session--I noticed that they stopped working in both of the terminal applications that I use heavily (Terminator and Guake); however, Alt key presses are still registered by the apps themselves (e.g., in Terminator, Alt-Left switches to the window frame on the left, and that works).

Also, my mind was just blown when I realized that Alt still works in gnome-terminal (which I never use). Before that I thought this was a bash issue. Alt-key combos also work just fine every where else in my Gnome desktop & applications. WTH!

Both Terminator and Guake are python apps.. but that's all I've got to start figuring this out. Any pointers?

What could cause the alt key to stop working in two terminal apps?

I use lots of keyboard shortcuts when I'm working with bash in a terminal. Two that I use heavily are Alt-d and Alt-. to delete the following word and to bring in the last argument of the previous command, respectively. Another bash/readline shortcut Ctrl-Alt-e also does nothing. (So basically, Alt doesn't work at all.) In the last twenty-four hours--somewhere in the middle of a marathon coding session--I noticed that they stopped working in both of the terminal applications that I use heavily (Terminator and Guake); however, Alt key presses are still registered by the apps themselves (e.g., in Terminator, Alt-Left switches to the window frame on the left, and that works).works). Edit: In other news Esc-d or Esc-. work. So I'm gonna look into the whole meta thing...

Also, my mind was just blown when I realized that Alt still works in gnome-terminal (which I never use). Before that I thought this was a bash issue. Alt-key combos also work just fine every where else in my Gnome desktop & applications. WTH!

Both Terminator and Guake are python apps.. but that's all I've got to start figuring this out. Any pointers?