Apple TV app for Windows / Cannot watch movies

Good evening

Since Friday, I'm unable to view my purchased movies (even downloaded).

When I try to, I'm asked to authorize my computer (which is already authorized, as stated in my account settings).

And when I give my e-mail & password, I get a message box: "A problem occurred with your connection status. Disconnect & reconnect." + a status bar message: "Your password has changed. Close your session on the Store, then reconnect".

I've try to disconnect & reconnect or to restart the computer, but the problem remains: I'm no more able to watch movies.