In 6.6 and a snapshot today (but not in 6.5 IIRC), there's a problem with xterm cursor appearance when using the keyboard to switch focus between windows...
An xterm which loses the focus still has a solid block cursor, rather than changing to an outlined block. In contrast, when switching using a mouse, an outlined block cursor is seen. This makes it alarmingly easy to type in the wrong xterm! Seem on three different amd64 machines. Ross
