I have the same issue. I also have WP-to-Twitter installed, so I wonder if this is the problem. I am not going to disable a working plugin that I really need to enable another plugin that might be useful. When I click the Add Account for Twitter, I get a 404 error. Facebook button gives the setup instructions window and LinkedIn tells me I need the Pro version. Only the Twitter button is bollixed, and that’s the one I need.
I am using WP4.1.
