:dependencies [[org.clojure/clojure "1.9.0-alpha17"]
                 [org.clojure/clojurescript "1.9.660"]
                 [org.clojure/core.async "0.3.443"
                  :exclusions [org.clojure/tools.reader]]
                 [sablono "0.8.0"]
                 [org.omcljs/om "1.0.0-beta1" :exclusions [cljsjs/react cljsjs/react-dom]]
                 [cljs-react-material-ui "0.2.46"]
                 [compassus "1.0.0-alpha3"]]

Then create:

(ns kap.core
  (:require [cljsjs.material-ui]
            [om.next :as om :include-macros true]
            [om.dom :as dom :include-macros true]
            [goog.dom :as gdom]
            [clojure.string :refer [join]]
            [cljs-react-material-ui.core :as ui]
            [compassus.core :as compassus]))

.....

(def routes
  {:routes      {:totals       TotalsTab}
   :index-route :totals})

....

(om/defui TotalsTab
  Object
  (render [this]
    (println "RENDER")
    (ui/mui-theme-provider
      {:mui-theme (ui/get-mui-theme)}
      (dom/button nil "ABC2")))



Change ABC2 to something else and let figwheel reload it and the button label won't change. Then remove ui/mui-theme-provider (leaving just dom/button) and the reloading starts working again. Then try not using compassus and it will work with ui/mui-theme-provider wrapper.