At Tue, 19 Jul 2011 13:22:10 +0200,
Suvayu Ali wrote:
>
> Hi Orgers,
>
> Scheduling or rescheduling seems to be invoking the debugger for me (I
> run emacs with debug-on-error set to t). Although it doesn't seem to do
> anything wrong to the scheduled entry. Strange!
>
> The error at the end was generated on attempting to reschedule a
> headline like this:
>
> ** TODO Read note on fitter
>    SCHEDULED: <2011-07-19 Tue>
>
>
> Debugger entered--Lisp error: (invalid-function org-loop-over-siblings-in-active-region)
>   org-loop-over-siblings-in-active-region("Scheduled to <2011-07-21 Thu>")
>   org-schedule(nil)
>   call-interactively(org-schedule nil nil)

This looks like a macro problem. Could you try

make clean
make

and see if the problem still persists?

Best,
  -- David
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