The "share" button does not work

I just installed the new 29 beta version;
1/ I installed it on the “desktop” : result: the complete desktop was “gone” Luckily I work with “time machine” and could restore the desktop very easily.
2/ on top of the menu: the section “share” does not work at all, so not possible to view in full screen or to export as a movie…

I can confirm that the Share menu is not working.

Yep, confirmed – Share menu not working.