Dead (compose) keys not working in GTK apps since upgrade

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http://unix.stackexchange.com – I'm running Kubuntu with KDE as my main desktop environment. A while ago I set up dead keys so I can type Chinese pinyin and other accented letters and special characters. As a side note, I use IBUS because it seemed to be easiest to set up my Chinese character IMEs with. Until the update, dead/compose keys worked fine in all applications. Now, they work in QT applications, but not GTK ones (such as this browser). This is unfortunate, as it's where I do most of my typing. My workaround right now is to type accents into KDE's launcher and copy past (Alt+F2, type using dead keys, Ctrl+X, Esc (HowTos)