Dock Notifications Displaying Odd Red Icons Instead Having an odd issue. My dock is showing these strange red icons where normal numerical notifications should be. For example, Thunderbird will display a 3 when I have 3 new messages, but instead it is showing this red A? icon. This happens with all the apps in my dock that display a notification. 

See attached screen shot:



Notice the Thunderbird icon at the top and the Printer icon at the bottom.

Anyway to get my standard notifications back?
This looks like it might be a problem with a system font.  Try this...


Open Font Book (in /Applications)
Select the "All Fonts" collection in the left-hand pane
Click any font in the right-hand pane to focus that pane
Select all the fonts using Edit -> Select All or Cmd+A
In the File menu, click "Validate Fonts"


If any fonts are corrupt, this method should alert you to the problem.