We've been receiving the following error: "There was an error loading this page. Please try again" when using the User Admin page. When attempting to load the same in Incognito mode, we were able to render the page, but after a few minutes of navigating, received the same error.
This is usually due to a corrupt filter setting that prevents the page from loading. Filters are saved as a Preference on a per-user basis. To clear the potentially corrupt filter setting, you can delete the filter preference. Each user experiencing this issue will need to walk through the process to clear their own preference.