Hi,
I updated to 6.6.1 this week-end, but cannot input japanese in any kind of text fields in my application anymore.
This is difficult to explain, but to input a japanese phonetic you need to press two keys in turn, i.e. to input the one character に you need to press n-i.
However, in 6.6.1 n is inserted directly, before allowing to add the next key or convert the phonetic character to the appropriate ideogram.