Odd font display problem on AIX 5.2/5.3 with _same_ fonts

[Albert Chin <gtk-app-devel-list mlists thewrittenword com>]

I'm having an odd font display problem with GTK+ 2.6.8 on AIX 5.3. I
made sure both the AIX 5.2 and 5.3 systems had access to the _same_
fonts. The ~/.fonts.cache-1 file generated on each system is the same.
I'm testing with the GTK+ demo program. Images of the initial window
is available from:
  ftp://support.thewrittenword.com/outgoing/gtk/aix52.png
  ftp://support.thewrittenword.com/outgoing/gtk/aix53.png

Why should the display be different if both systems have access to the
same fonts?

-- 
albert chin (china thewrittenword com)