Brains are annoying sometimes

Damn, I did some great work on a (work) project on Thursday and Monday, and a bit more on it yesterday, and I've got a working prototype. And now I'm kind of stuck because it's not good enough to show the person I'm prototyping it for yet, but I'm not quite sure of how to fix it, and I'm finding it hard to work on *anything* as a result. I'd best have some lunch and then see what I can do this afternoon.