Hey,
I mentioned this problem when WB4 was first released with no joy. So, here goes again.
The "Advanced Options" applet in Display Properties > Appearance doesn't work in WB 4.0, you can make the changes to fonts (style and bold,etc.), but when applied the settings don't hold. This applet works just fine in WB3.5.
Is there a work-around or a registry tweak available or in the works? The font scaling by % just doesn't cut it.