Key Combination, M-S-RET

[Esben Stien]

I've started using org-mode and org-insert-todo-heading is bound to
M-S-RET.

When I hit this combination in emacs (M-x help k), it says:

Describe key (or click or menu item):  ESC C-j

..and it opens a buffer:

C-M-j runs the command indent-new-comment-line
  which is an alias for `comment-indent-new-line' in `newcomment.el'.
It is bound to M-j, C-M-j.

So, somehow, emacs is interpreting M-S-RET as something else.

Any pointers as to what I can try?. 

I'm using emacs-22.3.2 inside screen.

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