The other problems is related to the...shutdown. Here it is a critical bug, which brings you to the login screen, when you select shutdown. I don't know why, but now the shutdown button has the same functionality as the log out one. Practically, there is now way to shut down your system from the OS. In case that you are here, what you can do in order to shutdown your system is to push and keep the power button on your PC/Laptop for 5 seconds (this cuts the power of your computer), or to unplug it from the power source (if you are on a laptop, use the first option). Both are improper ways of shutting down the system, but there is no alternative.
Note: My Ubuntu is up-to-date, at 9:15 GMT time, Monday, 14th of May, and the problems are not fixed. If an update appears in the update manager which fixes these problems, I'll update this article.