Since the Beta 4, my views don't update

A short update: I made some research in the past days about this problem and I found out the following similar issues filed in the Angular 2 repo:

Therefore I would say that this behavior was really caused by a bug and that NgZone is just a workaround that is not needed anymore because the issue should be fixed by the following commits in beta.6:

I would suggest you to update your projects to beta.6 instead of using NgZone on every line.