#6 - Nov. 6, 2010, 3:30 a.m.
As the others have indicated, it's possible an addon or other stray temporary information is interfering with your ability to inspect others, Bezerkk. You'll want to complete a full Reset UI first, and if that does not resolve the issue, please let us know in our Bug Report forum. I've included full instructions below for the process.
Common Display Issues http://us.blizzard.com/support/article/20377