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I have the same problem, only it's the Norwegian characters (æøåÆØÅ) I can't write.
These errors come on the console while I'm writing them:

(dockboard-outliner:7695): Pango-WARNING **: Invalid UTF-8 string passed to pango_layout_set_text()

(dockboard-outliner:7695): Pango-CRITICAL **: pango_layout_get_cursor_pos: assertion `index >= 0 && index <= layout->length' failed