I believe it is an ibus-daemon bug. I had the problem at least in gnome-terminal, firefox (but not under Unity), thunderbird. I solved it less brutally than flushing the whole user DConf database by resetting one key:
which contained the value 'gtk-im-context-simple'.
It worked:
* for gnome-terminal after logging again, restarting the program wasn't enough.
* for Firefox and Thunderbird only after restarting the system. The only user program that didn't restart after a relog was 'ibus-daemon', hence I believe it is his bug.
What makes me wonder is why the Compose key worked on Firefox only under Unity and not GNOME 3. There might be a second bug there.
I believe it is an ibus-daemon bug. I had the problem at least in gnome-terminal, firefox (but not under Unity), thunderbird. I solved it less brutally than flushing the whole user DConf database by resetting one key:
dconf reset /org gnome/desktop/ interface/ gtk-im- module
which contained the value 'gtk-im- context- simple' .
It worked:
* for gnome-terminal after logging again, restarting the program wasn't enough.
* for Firefox and Thunderbird only after restarting the system. The only user program that didn't restart after a relog was 'ibus-daemon', hence I believe it is his bug.
What makes me wonder is why the Compose key worked on Firefox only under Unity and not GNOME 3. There might be a second bug there.