Same here - by default in my env I have GTK_IM_MODULE=scim-bridge (and no scim in my GTK apps) but if I change that to GTK_IM_MODULE=scim then it works.
Same here - by default in my env I have GTK_IM_ MODULE= scim-bridge (and no scim in my GTK apps) but if I change that to GTK_IM_MODULE=scim then it works.