I use fcitx as my IME. I can use it normally in most graphical applications, but I can't submit my selection when using a terminal. The candidates window would show up as I type, but after I press space, nothing is entered.
I also cannot copy text containing CJK characters or symbols like ►. If I copy hi ► and paste in the terminal, nothing is entered.
I tried this in both xterm and xfce4-terminal.
And I can't even turn IME on in text mode (Ctrl+Alt+F2).