Not able to load SitesManager module

I’m new to Piwik and installed it on a sub domain (version 2.16.4). The first visitors are shown up already but there is one page that keeps loading; SitesManager.

Made a recording of the screen: Piwik v2

Any idea? I’m not a developer :smirk:

Edit: Tried different browsers (all the same problem)

I don’t know what it’s trying to load but that looks like an Ajax call that never completes. You could try checking your PHP and/or Apache logs for any errors.