Binary package hint: unity
In tabbed interfaces such as in gnome-terminal under unity it is difficult to visually distinguish the selected tab from the unselected ones.
In the attached screenshot, gnome-terminal has three tabs open, and the third one is selected. If you look close you can see the text is slightly whiter than the other tabs, and the border is a little more prominent but to my old man eyes it's really hard to see it at a glance.
Under metacity, the difference is more notable (or at least, the theme is different).
My guess is this is a theme issue rather than unity, but I'm unsure. If it is just a theme issue please refile to the right project.
DistroRelease: Ubuntu 11.04
Package: unity 3.8.8-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic-pae 220.127.116.11
Uname: Linux 2.6.38-8-generic-pae i686
Date: Fri Apr 15 17:41:12 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110202)
UpgradeStatus: Upgraded to natty on 2011-04-04 (11 days ago)