I am having the same problem, basically when the like button is clicked a comment field is briefly displayed with a post button beside it. This box only appears for about 1 second and then disappears. The like button remains unliked after this.
Any help would be much appreciated.
Solved,
In the dashboard I clicked on the updates link and chose the option (down the bottom of the page) which said re-install wordpress.
This made a difference but the layout was still a messed up so my next step was to go to permalinks and simply click on save all changes. This restored my site perfectly.
Re-installing wordpress didnt delete any content off the site so dont worry about clicking it.
Where it says “YOUR_SITE.com” in the above code I had changed this to my sites name
