Can't Build & Test multiple clients any more
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RavenWorks
When I try to use "Build & Test" with a number of clients above 1, one of the windows works fine, but all the others just sit on a black screen and won't even let me close them without doing End Task in the task manager.
I also actually tried manually launching two instances myself, using the --profile=1 argument for the second one, and encountered the same problem, so this might not be specific to Build & Test.
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Fax
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Hello, RavenWorks! Thank you for the report.
We're unable to reproduce this issue on our end. Can you please provide additional details that may help narrow down the issue? For example - does your VRChat log contain any unusual errors?
Fuwako
Fax
Hello, I also had that issue. I managed to reliably reproduce the issue for my case. I am uncertain if my case is similar to others, but I also found a workaround for my case.
Description
Subsequent clients that are started after the first client become black and inoperable.
This can also occur when attempting to build and test a VRChat world with 2+ clients.
On the official VRChat Discord, I found that other users mentioned the issue since September 11, 2025.
The issue seems to be dependent on the Logging setting. I can reliably reproduce both the problem and the workaround by changing the setting.
Reproduction steps
- Start VRChat normally.
- In the user menu, navigate to Settings → Debug → Logging.
Set Logging to "None".
- Quit VRChat. By doing this, the new Logging setting should be applied.
- Start a VRChat client via Steam or a shortcut, and allow it to fully load into the home world.
- Start a second client via a shortcut (same VRChat user profile or a different VRChat user profile).
Easy Anti-Cheat starts normally.
It indicates "INITIALIZING".
It indicates "WAITING FOR GAME".
VRChat starts with a white screen which abruptly becomes black after some time.
The VRChat window cannot be closed by clicking the X on the window bar. The process must be manually terminated.
Expected behavior
The first client and subsequent clients should all load and be operable.
Actual behavior
Subsequent clients improperly load and become inoperable.
Workaround
- Start VRChat normally.
- In the user menu, navigate to Settings → Debug → Logging.
Set Logging to "Errors Only" or "Full".
- Quit VRChat. By doing this, the new Logging setting should be applied.
- Multiple clients of the same profile and different profiles can be started.
Environment
OS: Microsoft Windows 11 Home
VRChat: Build 1769