Greek characters appearing garbled up at screen's caption

[Christos Gitsis]

Hello,

I have a problem with Greek characters appearing garbled up at screen's caption.

This is my .screenrc:

#Unicode on
defutf8 on

screen -t administrative 0
screen -t general 1

hardstatus off
caption always '%{= kG}[ %{G}%H %{g}][%= %{= kw}%?%-Lw%?%{r}(%{W}%n*%f 
%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B} %D %d/%m/%Y %{W}%c %{g}]'

termcapinfo xterm ti@:te@  #enables scrolling

You will notice in the picture here 
http://img160.imageshack.us/img160/9936/36068275pw1.png that the day of the 
week at the low right corner does not appear correctly in Greek, although Greek 
unicode characters appear correctly everywhere else in the xfce terminal. I 
think it is a strange problem. After all, the same font is used, isn't it?

I remember that some years ago when I did not have this problem on another 
machine that had Greek localization.

Any ideas?