I can't find where to view cinematics that I have "unlocked" (by having them occur naturally for game progress). Am I just missing it?
If you go all the way back to the login screen, there's a Cinematics button. You don't even need to log in.
If you can't see some cutscenes(possibly due to a corrupted/missing cinematics file), this thread details a workaround that unlocks all of them:
Make sure the game is closed before you do this.