Created attachment 223281 [details]
screenshot

I'm not seeing this in a brief test. Can you post it in comparison with another
terminal app? What color palette are you using in the terminal?

Gnome terminal has white on black palette. I'll put a comparison soon.

Created attachment 223321 [details]
Gnome terminal vs rxvt

Do you have a comparison of other apps *in gnome terminal*?

Created attachment 223341 [details]
screenshot

Sorry. That hit my mind soon after I posted the comparison but here you have a
new one. Both are white-on-black and tango colors.

jed by default uses the color 'black', which is the color in slot 0. vim is
using the 'background' color of the terminal.

With the tango colors, those aren't the same.

Thanks. Maybe I should tell the jed developers to use background or something
because this really looks like ass.

In your .jedrc, add something like:

set_color("normal", "default", "default");                      % default fg/bg

That should fix it for this case - you may need to replace other instances of
white (for foreground) and black (for background) with 'default' as well.