I think that this is an Emacs not org-mode problem, but maybe somebody can throw some light on it.
On my computer running 24.5.1 M<up> works as expected. However, on emacs 25.1.50.1 I get: Debugger entered--Lisp error: (error "There is no other window") scroll-other-window(-) scroll-other-window-down(nil) funcall-interactively(scroll-other-window-down nil) call-interactively(scroll-other-window-down nil nil) command-execute(scroll-other-window-down) However, in my org buffer: c-h w org-metaup org-metaup is on <M-up> which seems to indicate that the key is correctly bound. If I start emacs with a minimal config that just has (require org-mode), I still get the error. I then tried the "If it doesn't work hit it with the biggest hammer available" approach: (require 'org) (require 'ob-tangle) (eval-after-load "org" '(progn (define-key org-mode-map (kbd "M-<down>") 'org-metadown) (define-key org-mode-map (kbd "M-<up>") 'org-metaup))) but emacs thinks that M-<up> is bound to scroll other window. -- Best wishes, Ian.