Comment 6 for bug 554221

I was able to reproduce it.

Open any application (I tried with firefox and gedit)

Open a terminal and maximize it by double clicking on the title bar. (It doesn't happen if I maximize with the maximize icon)

Switch to the other application and hit close. The terminal closes.

Even better: all title bar actions affect the terminal not the window in the foreground (minimize, drag by title bar, etc...)

I use Lucid with the human theme, but happens with ambience too with the icons on the left side.
I thought it was somehow fglrx related, but same with the radeon driver.
I tested it with desktop effects turned off.

I'll do a clean Lucid install later today and check if it's still there.