If I have two instances of Blender open on Mac OS, my 3d connexion mouse works only with the one opened as last. In Windows, as far as I remember you could use it both opened instances. Is this some Mac OS weird security feature/bug that it only allows one app to talk to the external device?
Thanks for your thoughts
If you mouse works fine, then i think, it’s something like a bug/(some limitation).
My mouse works fine, it is only 3D mouse that works only in one Blender instance, that was opened as last. On the website of 3D connexion they mentioned this is Mac OS Bug.