Hi Carsten --

> I cannot reproduce this, can you make me a backtrace, please?

Sure. (I should also say I'm using Fedora 7, emacs 22.1.1, and org
5.15.)

I entered C-u C-c r

Backtrace --

Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p
nil) buffer-substring(312400 nil)
  (progn (buffer-substring (point) (mark)))
  (if current-prefix-arg (progn (buffer-substring ... ...)))
  (when current-prefix-arg (buffer-substring (point) (mark)))
  (list (when current-prefix-arg (buffer-substring ... ...)))
  call-interactively(remember)


-- 
John Rakestraw