Just guessing. Perhaps during the last shutdown something tripped, or delayed too long and was tagged as corrupt.
When you booted this am, a comparison didn't check out properly and clever coding allowed the error to be overwritten with last time's "list of things to do"
Perhaps that's crediting XP with more than its due, but if it doesn't become a regular feature - forget it.
(That OK button is a pain sometimes isn't it? You know disaster is only one click away but have only the option to click and enjoy!)