Make sure our baseDirectory ends in a forward slash

src/connectedComponents/ConnectedPluginSwitch.js

@@ -36,7 +36,7 @@ const mergeProps = (propsFromState, propsFromDispatch, ownProps) => {
 
   // TODO: Do not display certain options if the current display set
   // cannot be displayed using these view types
-  const Icons = `${window.config.routerBasename}icons.svg`
+  const Icons = `${window.config.routerBasename}/icons.svg`
   const buttons = [
     {
       text: 'Acquired',

src/connectedComponents/ToolbarRow.js

@@ -6,7 +6,7 @@ import ConnectedLayoutButton from './ConnectedLayoutButton'
 import ConnectedPluginSwitch from './ConnectedPluginSwitch.js'
 import './ToolbarRow.css'
 
-const Icons = `${window.config.routerBasename}icons.svg`
+const Icons = `${window.config.routerBasename}/icons.svg`
 
 class ToolbarRow extends Component {
   static propTypes = {