11.3 kde4 how to prevent konsole/htop/bash to use bold character ?

As exposed in a previous thread :
11.3 64b nvidia kde4 : font color bug in konsole
I have a problem in the konsole terminal . I chose the Fixed [misc] font and i want the size 3. But for some unknown reasons konsole wants to display some chracaters and some words in bold . As This font doesn’t exist in size 3 in bold, it displays the bold characters in size 7, which is the smallest available bold size for this font set (Fixed [Misc]) . It makes any of these bold characters unreadable as they are too large compared to the room they have to be displayed.
How can i prevent konsole , bash , htop or any program responsible for this behaviour, to display such bold character ?
Is this a known bug ?
Any hint ?
Shall i file a bug report ?
Thanks.

I have tried to set my font to Misc Fixed to 3, not bold, and works well.
I have the same OS and nvidia. But mine is 32bit.

Is it in konsole ?
Have you tried htop ?
Which nvidia do you have ?
What driver do you use ? Nouveau or nvidia proprietary ?

To explain more accurately what i mean here are two scrennshots :
http://lists.kde.org/?l=kde-linux&m=128213031328054&q=p8
http://lists.kde.org/?l=kde-linux&m=128213031328054&q=p7