I made a fresh install of the community version (2016.2.6379.27755) on a new machine and I have the same problem as the OP. On my other machine I had 2016.2.6344.28632, which worked fine.
Can somebody please post the link to UiPath.Core.Activities.2016.2.6379.27755.nupkg ?
It seems like this bug goes back as far as February this year: