In addition to possibly being related to the 3rd party resource, as you're using a custom theme... it's also possible it was a problem with the theme itself. The areas it is noting in the area involve navigation, which was updated recently. So it's possible your custom theme was never updated to reflect those changes.
I would suggest testing the site with the 3rd party app enabled, but with a default theme. If it continues working, the problem would be in your theme. If it does not work with the app enabled on a default theme, it would indicate it's a problem with the app itself.