In fact, WS01 is working with Max launched, the other one only with DRserver and no License server installed.
I think I solved the problem by installing a fresh hotfix 3.
Also, the scene is pretty heavy with a lot of displace & proxies, so I think it didnt helped sharing the scene through the network.
I have a bug on the list of connected slaves into the VFB, not showing any movment of RAM/CPU that's why I get crazy...