I updated today to 2.0.40 and have similar problems to Jessica:
- Duplicator Plugin doesn't work: If you click on buttons, nothings happen
- Cache plugin "WP Fastest Cache": if you click on "Delete cache" in the admin bar, nothing happens any longer.
If I deactivate Post grid, everything works.
With the former version of Post grid there wasn't any problem.
It would be great if you could solve it quickly.
Welcome to our forum.
Can you please check browser console area if you see any js error might be cause the issue.