Word 2013 doesn't show unicode text in find/replace window, shows black boxes.

[vsrawat]

I have Word 2013/ 365 on w7 pc.
It doesn't show unicode text (hindi - devanagari) in find/ replace windows (ctrl-H, ctrl-F), shows black boxes instead, one each for each character.
though it replace the same text correctly.
Unicode text is correctly visible in the full file.

how to resolve it? All work held up. :-(
Thanks.
--
Rawat