I have only experienced the first one mentioned, on my Mac. I simply ignored it, though I would very much like to have a solution to things. (Even if I don't play the demo any more, it's nice to know why.)
My suggestion - Buy the full version of Book I anyway. It's exceptional! You'll love it, and I never experienced a single problem in the full version, as bugs are usually sorted out from demo to Full Version. Whatever you decide to do, don't just drop the series. If you have to, go through it with the bugs, because it is more worth it than you know.
Sorry, but I have a little bit of difficulty buying a program when the graphics in the demo fail like this.......
Screen shot 2011-05-20 at 1.18.39 AM.jpg [ 159.76 KiB | Viewed 576 times ]