Network card does not work after updating REACTOS

Hello
 
I installed ReactOS 0.4.12 release virtually on Ubuntu with QEMU/KVM.
It works great but if I update it with last ReactOS iso version, I have no more network.
Network card is recognized by ReactOS and seen as "fully functionnal" but I have no network connection.

I can reproduce that bug everytime:

install React 0.4.12 with QEMU/KVM, networks works. Update it with last ReactOS iso, no more network.
If I install directly last dev iso as a new install, network card works as expected.
 
Do you need a log file? If so, how could I obtain it?
 
Thank you for your help.