n346 here....doing the same thing. No switch pages will load, however I'm getting some client data to load but not the client graph that normally loads on the client page.
Unfortunately the new switch view is insanely slow and clunky, so I've held off on using it, seems like that is coming back to haunt me now. I don't even see an option to go back over to the new view since the only thing on the page is "this content failed to load"
Was able to fix this by clearing cache and reloading the page...or more specifically, navigating to a page that throws the error above and pressing Shift+F5. Worked for my coworkers as well.
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