- 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.
- 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.