- Certificates (an old credential mechanism) are no longer supported. If you have a certificate, `arc` will behave like you do not have any credentials. Follow the login prompts to convert your certificate into a token and things will work correctly again.
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[ ] `arc browse` tries to make anonymous calls to `phid.lookup`, `diffusion.querycommits`, and other stuff indirectly via `loadRepository...` which aren't public and will never work. It recovers cleanly but these should be public on public installs (and, ideally, modern).
[ ] `arc browse` should display a proper warning if it is running anonymously; currently it can spew unrelated warnings and then choke. Needs engine-has-token tests, and all this messaging should get cleaned up.