Same problem here. Using Ubuntu 9.04 64bit, Brazilian portuguese. Can type deadkeys everywhere except on wine applications(notepad, office 2007). I'm using scim/scim-bridge(portuguese/japanese) too and works on native linux GTK/QT applications, but doesn't work on wine..... just an extra information. Maybe it helps to solve this issue.... or not. :-)
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Wisdom of the Ancients
