I've been using Utau for about a year now and I have always encountered this issue. I can't make any Japanese Utaus sing. Japanese characters appear as jibberish and won't make any sound. English voicebanks work fine but it's only Japanese won't make sound. I've heard about changing the locale to Japanese but I don't know how to do that. I can't speak Japanese but I still want to create covers of Japanese songs. [I'm using Windows 10 with the English version of Utau].