As described, I can see the tooltips of icons on the gamebar, but nothing happens, not even an error, when I click on the icons. None of them, except time, which shows calendar and stopwatch.
Same thing for item bars.
I use french client.

I can second this issue. Used german client.

@bguende @RodiakWolfshain Just read the changelogs, it is blizzard's fault.