When using either screen or tmux with emacs, I experience some incompatibilities that I do not experience when not using screen or tmux. Normally I would see this as a screen or tmux bug but I do not experience these problems when using xterm or putty.

Some such incompatibilities are:

M-x horizontal cursor-key :: 
  - Supposed to: Move by a word.
  - Actually does: Inserts characters '3C' or '3D' depending on the cursor-key.

C-x horizontal cursor-key :: 
  - Supposed to: Move by a word.
  - Actually does: Inserts characters '5C' or '5D' depending on the cursor-key.

M-ret ::
  - Supposed to: In org-mode, new-line move cursor intelligently on next line.
  - Actually does: Inserts new line but does indent properly.

This occurs with empty ~/.screenrc and ~/.tmuxrc configurations on Fedora 12.

screen: 4.00.03
tmux: 1.1
emacs: 23.1.1
gnome-terminal: 2.28.2

Thanks,

Michael