How long have you been playing the game? Did you first start a long time ago, or did you only recently download? I had to change how characters were unlocked last year or so which caused characters to get re-locked. As for the scenes being locked, that is weird UNLESS you changed computers mid-game. The data for whether you saw something is in your "persistent" data which is computer specific.
There is a cheat code to unlock all characters in Open Mode: hit F1 (or letter C if you changed it ) and type: "fuck this unlocking shit" (no quotes) That should solve your problem in the mean time.