mouse-on-link-p: Wrong type argument (integer-or-marker-p)

[Clifford Wulfman]

Moving the mouse pointer over the splash screen, items in dired, 
inverting text in the *Apropos* buffer, etc. results in a beep/bell and 
messages of the following sort in the minibuffer (and in the *Messages* 
buffer):

mouse-on-link-p: Wrong type argument: integer-or-marker-p, (#<window 14 
on *Apropos*> 269 (94 . 75) 0 nil 269 (11 . 5) nil (6 . 0) (8 . 15))

The problem appears to be in the function tooltip-show-help-function 
(in tooltip.el); the variable pos is being set to the cdr of 
(mouse-pixel-position) and then passed to mouse-on-link-p, which then 
breaks.

I've tried launching w/o a .emacs file (mv ~/.emacs ~/.emacs.bak; open 
/Applications/Emacs.app) with the same results.

Disabling tooltip-mode makes the problem go away.

In GNU Emacs 22.0.50.1 (powerpc-apple-darwin7.8.0)
 of 2005-02-19 on Freia.local
Distributor `Apple Computers', version 10.3.8
configured using `configure '--enable-carbon-app' '--without-x''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:
M-x r e p o r t SPC e m a SPC b SPC <return>

Recent messages:
Loading mwheel...done
(/Applications/Emacs.app/Contents/MacOS/Emacs)
Loading tool-bar...done
Loading image...done
Loading tooltip...done
Loading 
/usr/local/share/emacs/site-lisp/xml/nxml-mode/rng-auto.elc...done
Loading emacsbug...done