When Chinese characters are entered in the edit area and click Preview, all of them will turn into blocks. The system is Windows 7 sp1, Locale is Chinese simplified, the app version is 1.1.2, portable version. Another user also reported similar problem. I'm not sure about his program version and operating system.
Also the Preference menu item has no effect at all. When clicked nothing appears.
I wonder if this is due to the font setting, but I can't change this setting, because I can't access the preference. I didn't see any setting about fonts in the configuration file under the program directory either.