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"CarlC" <carlc@snowbd.com> writes:

>           (beginning-of-buffer)

Don't use `beginning-of-buffer' in Lisp code, it'll cause the type of
problem you describe.  Use (goto-char (point-min)) instead.  The same
applies to `end-of-buffer'.

>           (previous-line 1)

You usually don't want `previous-line' in Lisp programs  -- use
(forward-line -1) instead.  Ditto for `next-line'.