Yes, I'm sorry to say that server problems are continuing, from time to time. I'll be taking steps to improve things, but for the time being all I can suggest is, if the site's not working, come back later and try again. Once again, my apologies for any disappointment you experience.
MM, I like your idea of an indication of the time situation of each of the puzzles, just for the convenience of knowing what's happening without having to flit from puzzle to puzzle. I'll look into it.