The tag validation window does not reserve enough space for Japanese errors. The effect depends on the platform but in some cases there is just enough width for 2 characters which makes reading inconvenient.
I suggest adding a:
width="10%"
attribute
to the 3rd in the table on line 377 of TagValidationFrame.java.
I tried it with French/English/Russian and Japanese and the result is satisfying and does not break the behavior for languages other than Japanese.
Since there does not seem to be opposition to that modification, I'll implement it.
Fixed in the released version 3.0.1.
Didier