I have the same problem.
If a user clicks FIRST on a submenu item from a list of drop down submenu items under it, NEXT gets the submenu item page displayed and then AGAIN NEXT clicks on the op menu item itself, the linked top menu item page is NOT displayed, so nothing happens and one remains on the submenu item page.
On any other theme this would work. It is a natural possible selection by a user once he is done looking at the submenu item page.
So basically the top level item becomes unclickable after selecting a submenu item.
I also am on Site5 and have the Wordpres installation through Softaculous.
And I also get the message: ‘Looks like something’s gone wrong. Wait a couple seconds, and then try again.’
It happens when a change is made to a menu (add item) and I attempt to publish it.
The previous suggestion to reinstall WordPress using Softaculous and set it as multisite has no impact.
Note that the site I am installing is onE of severAL addon domainS I have with site5.
