Green blinking 'D' in console

[Aaron Maxwell <amax@redsymbol.com>]

Hi.  I'm running yesterday's sid.  In the console, occasionally a green 
blinking 'D' will appear at a certain position on the screen.  When and where 
it appears seems to be random.  It will scroll and can be 'overwritten', just 
like normal text.

I've seen this about  8 times in the past six days (I apt-get update every 
day or three)..  It's always a green blinking 'D', never another 
letter|color|state.

Anyone experienced this?  Anyone know what might be causing it?

TIA,
Aaron