KDE doesn't handle compose correctly - e.g. compose + / + o = ø , compose + " + u = u with umlaut. KDE apps (like konsole) ignores compose, and will insert /o, "u for these.
Works perfectly in 3.0.0-0.cvs20020211.1 (at least with a "normal" keyboard that emulates Compose using Shift+AltGr). Writing from Konqueror: x | g h i
(... but Bugzilla doesn't handle the characters correctly, they were there before bugzilla magled them ...)