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You obviously are missing a coat of arms for that duchy

Go to Crusader kings/gfx/coa folder and see if you have a bmp file in there called VAST

If not, just copy a bmp-file from in that folder and rename it VAST
 
Frank5 said:
somehow :confused: it has fixed while i was been playing...coa already visible :)
lots of times if you just exit the game and come back problems are fixed.