OUTAU keeps crashing when trying to render Diffsinger ;-;

[sketch-844]

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

First, I'd like to say that OpenUTAU has been AMAZING for me. But... I have a problem. Whenever I try to render out some audio using a DiffSinger voicebank, there is a small chance that it will crash while I'm rendering. This most commonly happens with ROI (my beloved ❤️, peak voicebank).

*** I know that there is another thread (#2134) with this issue but that one is closed, so I'm not sure what to do.

Explains how to reproduce the bug

How to reproduce the bug:

1. Write a part using ROI
2. Hope that it crashes 🙏🏼

(In other words, I legit do not know how to recreate it. ;-; It just happens.)

This is what it displays before it crashes while rendering. ...Yeah idk what to do.

If you need a ustx I can provide it, but ROI so far is discontinued bc 6twelve.boo is down

OS & Version

macOS 26.6.2

Logs

log20260826.txt

[sketch-844]

Ok update I think it has something to do with '[ERR] Avatar not found' because I found those errors at 10:45 (around the time where I tried the rendering) and they were in the debug window? Not sure though but just in case you need any more details that's what I found.

EDIT: I rendered it out with a different DS VB and it works fine :|

[BagelHero]

Any chance you can share that UST? For the error, the closest relevant one would actually be

2026-08-26 09:44:58.184 -04:00 [WRN] Failed to create session with CoreML subgraphs enabled, falling back to default settings
Microsoft.ML.OnnxRuntime.OnnxRuntimeException: [ErrorCode:RuntimeException] Exception during initialization: unordered_map::at: key not found
   at Microsoft.ML.OnnxRuntime.InferenceSession.Init(Byte[] modelData, SessionOptions options, PrePackedWeightsContainer prepackedWeightsContainer)
   at OpenUtau.Core.Onnx.getInferenceSession(Byte[] model, OnnxRunnerChoice runnerChoice) in /Users/runner/work/OpenUtau/OpenUtau/OpenUtau.Core/Util/Onnx.cs:line 138

And I can't say I've ever seen that before. It may also be something up with your copy of ROI, depending on when and where you got it. I'm testing mine and not able to replicate thus far.

edit: wait, wait. Maybe a mac issue. What mac hardware are you working with?

[sketch-844]

Ok so:

1. I got ROI from 6twelve.boo which is the site linked in their channel bio (currently "under big renovation" (who knows when they'll be finished I think it's been like a year??))
2. I'm using an M4 MacBook Air.
3. I did switch the voicebank to render out the audio earlier so I had to switch it back today, and it crashed again. I can't upload it because it's a .ustx file and it says it's not supported for some reason...

[sketch-844]

I updated to 0.1.569.0 and it rendered just fine! But I will keep an eye out for this issue later.