Please see http://bugs.freepascal.org/view.php?id=1621

Now, on a second though, maybe the defaults should be changed to include a background color?
I tried around a bit, Yellow is probably nice for the default-color-scheme.

However my taste (or rather missing tase for matching colors) is likely to make not so good looking choices for the others color-schemes. If someone has any prefs, let me know. It will be easy to put it into a patch.