Hello Stephane,
I suppose issues in the command line, I put together bat files based on Switchboard launch strings.
Please find attached sample project with MONOHOST_FINAL config and Launch Monohost.bat file that works well on my end.
I tried launching multihost (replacing ips to 127.0.0.1) as well which works well on my end too and primary output looks okay. Could you please try launching with the Switchboard and share logs if problems persist?
I would also recommend using newly created project from nDisplay template instead of template itself.
[Image Removed]Let me know if that helps!
best,
vitalii boiko