We're sorry for the inconvenience, we're aware of this issue and we're working on it right now and hope to fix it in the next updates of the Windows app.
When is this due to be fixed. This has severely damaged the useability of this. I would not have subscribed if I knew this did not work (not running my administrator account to work around)
We're sorry for the inconvenience, we're looking into this issue. Please note that you can use the full web version at https://todoist.com and you should be able to input Chinese characters through the web.