Hello, Current version: GNU Emacs 24.4.50.1 (x86_64-apple-darwin13.3.0) of 2014-07-14, bazaar revision: 117528 On OSX, under tmux (and outside), emacs 24.4.50.1 (trunk), the mouse drag to resize pane does not work anymore. (It used to work fine on emacs24.3) drag and drop pane separation: result in outputing escape charcters in buffer (ex: [<0;133;27m), error: Wrong type argument: number-or-marker-p, nil Regards, -- Guillaume J. Charmes about.me/guillaumecharmes [image: Guillaume J. Charmes on about.me]