Some days ago I changed the font used by kde from the generic "Sans" to Linux Biolinum O.
So far so good, the font look gorgeous everywhere (menus, notifications...) BUT on the task manager:



As you can see from the screen shot, there is a problem with vertical alignment: text is lower than app icon and if the bar is thin text get cropped. This did not happen when using the other, generic font.
Yes, I know I can change the font again but... I prefer to use this font
KDE SC 4.6.5 on openSUSE 11.4, 64 bits. The problem do not depend on the plasma theme.
Any idea?
Thanks!