This morning I've uninstalled the 219 build and installed the 220.
After that I've relaunched my solution and I've tried to debug a unit test, in another file I have a couple of error so the compilation failed.
From that moment the keyboad in VS doesn't work anymore, all I can do is to close and restart the IDE.
I've tried to compile the solution with the CtrlShiftB, it finds errors but the keyboard continue to work.
With this release I've noticed a huge performance downgrade... it's more, more, more slower than the 219 build.