Widgets toggle unresponsive in dashboard of WP 3.6-beta3-24372.

I just realized that widgets toggle is unresponsive in Widgets section fof dashboard of WP 3.6-beta3-24372.
For instance, I cannot access the widgets contained in my sidebar in the dashboard.
3.6-beta3-24372 is a nightmare. Add media button in post area is not working either.