You can possibly work around this by selecting another input method (IM) with 'im-config' or by removing ~/.xinputrc (which selects the default for your locale) and then reboot (or restart X11—log out & back in is not always enough).
The default IM for most languages is 'ibus' which you can configure with 'ibus-setup' if necessary (but only after the X restart!).
For some reason the ibus developers think it's funny to show a "smiley face" during entering of a Compose sequence, but otherwise it seems to work okay now.
You can possibly work around this by selecting another input method (IM) with 'im-config' or by removing ~/.xinputrc (which selects the default for your locale) and then reboot (or restart X11—log out & back in is not always enough).
The default IM for most languages is 'ibus' which you can configure with 'ibus-setup' if necessary (but only after the X restart!).
For some reason the ibus developers think it's funny to show a "smiley face" during entering of a Compose sequence, but otherwise it seems to work okay now.