Inputfield: Japanese symbols not appearing when IME used on PC (works on Mac)

Hi!

I have an inputfield in my game Her Story in which the player types text search strings. Currently when I do this using a Japanese IME on PC, the Japanese words don't appear until I hit Enter, or complete a string -- whereas on Mac, I can see the string in progress and make choices between Kanji/etc, as expected.

Any tips on how to get PC to play ball and work like the Mac?

--Sam