Mac OS X users who input Japanese may notice that the Hiragana character for "ri", U+308A, can appear in two different forms, shown below :
Which one is displayed depends on what font is used by the app or system. The main Japanese font, Hiragino, uses the first (connected) version, while the Osaka Japanese font and some fonts for Chinese and Korean, plus Arial Unicode, use the second (two strokes).
The default font for Chinese/Japanese is often determined by the order of the languages in System Preferences > Language & Text > Language, so to guarantee you get a Japanese one you should make sure that language is higher on the list than Chinese or Korean. If you want to have the two-stroke "ri", you will have to also switch Hiragino to Osaka.