This has already been reported. Please browse the latest posts and make use of the search function before posting.
I faced the same problem. As the screenshot is shown, the WYSIWYG cannot display the Chinese character in the editor window. I tried to search for the latest posts, but I didn’t find the solution. Have you solved the problem?
No, this issue isn’t resolved yet. Version 3.7 was just released Thursday and this issue was just discovered.
You can disable WYSIWYG editing until it gets worked out.