In my new Piwik installation, when clicking the date range area, I can select day, week, month, year, date range. I can see the apply button before I make my choice, but when I choose day, week, month, year, the button disappears and nothing happens. Only after selecting date range, the apply button remains and can be clicked.
Looks like it’s a browser problem.
Got the same behaviour when working with Chrome, even on demo.piwik.org. No problem at all when using Firefox.