Ripping seems to work better now. I think my problems are skin related. After updating my PMIII skin to beta3 a lot of the problems are solved. Except the following...
It would still be nice to get a message when ripping can't be executed (because of protection, or unreadabillity etc.). And also, when MyMusic is grabbing iformation from the internet about a audioCD, it can take a small amount of time. It would be nice if there would be a dialog that tells you to be patient while information is being download. So you know MP isn't crashed. And a message of no information could be found.