I see new lock icons showing up in my 5.0.2 site I just upgraded to 5.0.5... they're for external links.
Unchecking the box “Mark special links: If enabled all external links will be marked with link type specific icons.” in the theming control panel Advanced Settings -> Theme Base tabs didn't seem to have any effect.
I see the configuration registry has 7 entries for "markspeciallinks"... wondering what I have to do to disable these...