issues with highlighting

I'm playing with a project created by lein new ii_2. The core.clj file looks like:

(ns ii-2.core)

(defn foo
  "I don't do a whole lot."
  [x]
  (println x "Hello, World!"))

When I select either parenthesis around the ns form, neither one highlights.
When I select either double quote around the docstring, neither one highlights.
When I select either double quote around "Hello, World!", neither one highlights.

All other parentheses and brackets highlight as expected.

JetBrains / la-clojure