I don't know if this was the same issue but here was the issue for me: While watching Simpsons Season 6 DVDs on my Mac, and enabling the embedded "Deleted scenes" option while playing the episodes (what is called the "Seamless branching" technique to play additional content durin...
Being insomniac very often, I have the habit of watching series or movies at night. And as I often fell asleep in the middle, I use the OSX scheduled shutdown to avoid my Mac of running all night for nothing. But each morning, I have the same message saying that the shutdown couldn't be made because...