Something fairly simple woudl be a Chat Bot. Something that you type stuff two and it responds based on your input. You could do it command line, or you could make a swing application.
My guess is that it's the cache. That happens to me too only when I'm developing in ASP.NET my computer caches the page, so I have to hit refresh to see the updated page. Just give it an hour or so and you sohuld be fine. I think you can also set IE to NOT cache pages.
