I'm posting this here so I won't forget in future.
My lesson for the day; finish what you're doing before going home. Last night, I was half way through making my point for my tutorial intro comment (I know, I know, what point?). I realized I'd arranged to meet someone and needed to leave in a hurry to catch the train. I left everything open on my desktop. Needless to say, looking at it this morning, I have absolutely no idea what I was going on about. It all seemed so clear before I left last night...