tooltips crash emacs on os x

[Rib Rdb]

eval (x-show-tip "test message") and emacs will crash.

I've got logs from crash reporter if they would be helpful, but this 
seems to be common to all of them:
Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_PROTECTION_FAILURE (0x0002) at 0x00000008

Thread 0 Crashed:
0   com.gnu.Emacs       0x0013e798 Fx_show_tip + 0x204 (macfns.c:3937)


In GNU Emacs 21.3.50.1 (powerpc-apple-darwin7.3.0)
 of 2004-04-22 on Rib-Rdbs-Computer.local
configured using `configure '--without-x' '--prefix=/usr/local''

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