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From: martin rudalics <rudalics@gmx.at>
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Subject: window-scroll-functions
Date: Fri, 01 Sep 2006 08:50:05 +0200
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When an error occurs in calling a function in `window-scroll-functions'
Emacs may behave very strangely.  With Emacs -Q inserting

(defun foo (window start)
   (error "?"))

(add-hook 'window-scroll-functions 'foo nil t)

in *scratch*, doing M-x `eval-buffer', and then C-l, Emacs shows me the
window without scrollbar, modeline, and buffer text.

In GNU Emacs 22.0.50.1 (i386-mingw-windows98.3000)
  of 2006-08-27 on MACHNO
X server distributor `Microsoft Corp.', version 4.90.3000
configured using `configure --with-gcc (3.4)'

BTW, Emacs 21.2 shows scrollbar, modeline, and buffer text for this.