Hello Julian,
Several our customers, using Chinese language, have problems.
They are not able to delete Chinese characters.
How to reproduce:
1. Type in a few Chinese characters using alphabetic combinations such as "yi", "zhi", "qi", "wu" which should translate to Chinese characters then press BACKSPACE - you'll see that it works.
2. Hit ENTER after a few Chinese characters to go to a new line and try to press BACKSPACE - you'll not be able to delete any characters unless you press 12 times BACKSPACE .
3. After keying in a longer sentence eg. 20+ different Chinese characters, use your mouse to position in the middle of the line and press a series of BACKSPACE and DELETEs - you'll might see that some of the Chinese characters change into squares instead!