OpenUTAU keeps crashing whenever i put in Japanese letter

[crusato]

Acknowledgement

• I have read Getting-Started and FAQ
• If dealing with version 0.1.549 or higher, you have installed the .NET 8 runtime

🐛 Describe the bug

basically,
i make new projects, i double click "a", i put in a Japanese letter, and then it crashes

Screen.Recording.2026-03-12.164154.mp4

Explains how to reproduce the bug

1. Run the software
2. make a new project
3. click once for a pink rectangle
4. double click the rectangle
5. another window should open and you must click once for the letter "a"
6. double click "a" then put in a random Japanese letter
7. once it freezes you must crash

OS & Version

windows 11

Logs

Failed to render.: Try installing the latest Visual C++ Redistributable. https://learn.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist?view=msvc-170

Unable to load DLL 'worldline' or one of its dependencies: The specified module could not be found. (0x8007007E)

System.AggregateException: One or more errors occurred. (Unable to load DLL 'worldline' or one of its dependencies: The specified module could not be found. (0x8007007E))
---> System.DllNotFoundException: Unable to load DLL 'worldline' or one of its dependencies: The specified module could not be found. (0x8007007E)
at OpenUtau.Classic.WorldlineRenderer.<>c__DisplayClass8_0.b__0() in D:\a\OpenUtau\OpenUtau\OpenUtau.Core\Classic\WorldlineRenderer.cs:line 68
at System.Threading.Tasks.Task`1.InnerInvoke()
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of inner exception stack trace ---

0.1.565.0

[BagelHero]

Before I suggest anything else, did you try installing the latest Visual C++ Redistributable like it asked? https://learn.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist?view=msvc-170

[crusato]

Before I suggest anything else, did you try installing the latest Visual C++ Redistributable like it asked? https://learn.microsoft.com/en-US/cpp/windows/latest-supported-vc-redist?view=msvc-170

I have installed it, it no longer crashes, however the voicebank now produced no sound

[BagelHero]

Apologies for the delay, hopefully you figured out via Getting Started or a tutorial that you just needed to set the phonemizer.

The phonemizer is important for OpenUtau to be able to interpret lyrics. In order to set the phonemizer, click the area under the singer name on the Track Header (this likely says DEFAULT if the voicebank was made for UTAU).
From here, select the phonemizer based on desired language and type of voicebank you're using. Not all voicebanks can use any phonemizer or language, so be sure to become acquainted with the kind of voicebank it is. That information should be listed in the readme, website, wiki page or release video for the singer.

In this example, the singer is Japanese and 連続音/VCV and so is the song, so we select JA > JA VCV or JA VCV & CVVC