I recently started using emacs and mu/mu4e. And I like it! Using mu4e 1.4.13.
When I started using contexts for my 2 mail accounts it introduces a couple of new problems:
First of all when I start mu4e it does not start, but gives this message:
mu4e-error: [mu4e] root maildir unknown; did you start mu4e?
However, loading mu4e the second time, it seems to start as normal. I use M-x mu4e to start mu4e, and I start it right after starting emacs.
If I switch from mu4e main view to another buffer, I can't switch back to the mu4e main view buffer. It is not showing in the buffer list anymore.
My mu4e-config looks very close to the example provided in the documentation.