only by changing you skin.. the color scheme of the skin causes the text to disappear in the pop-up box. It depends on how you are viewing the site from. IE, from a monitor you may be able to adjust the settings somewhat to view the text. The 'house' forum, on my laptop I cannot read the text, on the mac monitor I can read it just not easily, but on the HP monitor I can adjust the settings and it's nearly perfect.
If you can adjust the RGB of what you are viewing in on/from, it should help, if you cant no, the only thing that you can do is change skin.
The other thing you can do, if you just looove your spangel.. is deselect the Buffy Boards window.. for some reason if I do the karma box.. type out the message and then click another window (like the browser bar at the top) the screen color changes. But then as soon as you make the Buffy window 'active' again, it changes back.. so theoretically you could read it, it would just be a bear to edit.