UPDATE: I fixed it! This turns out to be a bug with the "Logging" setting inside VRC (as shown inside the second screenshot) Turning this setting "off" results in the described bug!
SDK 3.8.1 (also 3.8.2, I tried upgrading). Release 2025.2.3, build 1664 (going off the steam update notes).
Description:
Upon using Build&Test with two clients, only the first client will successfully load in. The second one will just hang on a black screen, with no loading whatsoever. The only way to close that inactive window is to use task manager. The same seems to happen with three clients, only the first one will successfully load in. I believe it worked fine until yesterday
How to reproduce:
Attempt to Build&Test, for windows, with two+ clients. Tried with VRC quick launcher as well, using Build&Reload with 0 clients and letting the quick launcher open them.
This makes testing for networking issues quite a bit harder
Logs and more information can be provided if needed