Created attachment 183470 [details]
Screenshot & annotation of problem 

Problem: gnome-terminal gets littered with dark shadows after various events. 

Events include pressing enter (area near prompt gets shadowed), pressing space for a bit and enter (cell in last column on line gets shadowed), pressing many spaces and enter (same as previous, plus entire next line gets shadowed), unmapping a window (area where window was gets shadowed).

Clearing the screen with ^L clears the screen of shadows.

The issue doesn't happen for all background colors.

To reproduce:

Start gnome-terminal
Set background color to #A88858
Press space a few times and then enter. Observe shadows.

Attachment:

Because the color difference of the shadows is subtle, I did "select by color" in GIMP to make them obvious.

I reported this bug to Ubuntu here:

  https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/735627

before realizing vte's bugzilla was probably better.

DistroRelease: Ubuntu 10.10
Package: gnome-terminal 2.32.0-0ubuntu1