YOU ARE A GENIUS!!!
How did you learn the thing about the arrow keys? OMG the "cannot play this title" thing has been driving me nuts! Though it has been keeping my son from watching that horrid "Johnny Test" show, so the breakage had a positive side effect... But tonight he wanted to watch "Blue Planet," and that's when I decided to get serious about finding a solution. Deactivating and reactivating fixed everything. I'm going to have to save that little incantation somewhere. Thank you!