There is nothing unusual going on here. The reason you do not see this with other icon themes is because they do not make the gtk-close icon a button. I have no real preference on whether or not it is a button. The problem can usually be fixed adjusting the x and y thickness in the gtk theme, but as stated, not in 'looks'.
1. put 2 pixels of transparency between the icon and the icon border 2. go back to an X -- Bad close icon https://launchpad.net/bugs/46801 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
