Trying to get a few cider things straight today...
When I create a new clojure project with lein new, and then jack into it from my project.clj, the repl is in the clojure.core namespace instead of user.
Obviously I can switch, but it's annoying to do each time. I found this answer, lein repl starts in wrong namespace, but changing :repl-options is having no effect.
clojure-test-mode
together withcider
was causing some ns init problems, but nobody has reported any of those in quite a while. – Bozhidar Batsov