diff --git a/example.config.js b/example.config.js
index 92de30c..222355e 100644
--- a/example.config.js
+++ b/example.config.js
@@ -3,8 +3,8 @@ module.exports = {
   SERVER_ROOT: 'http://localhost:4040',
   EVENT_EXT: '/api/example/export_events/rows',
   CATEGORY_EXT: '/api/example/export_categories/rows',
-  EVENT_DESC_ROOT: '/api/example/export_events/ids',
-  TAG_TREE_EXT: '/api/example/export_tags/tree',
+  SOURCES_EXT: '/api/example/export_events/ids',
+  TAGS_EXT: '/api/example/export_tags/tree',
   SITES_EXT: '/api/example/export_sites/rows',
   MAP_ANCHOR: [31.356397, 34.784818],
   INCOMING_DATETIME_FORMAT: '%m/%d/%YT%H:%M',
diff --git a/src/actions/index.js b/src/actions/index.js
index fe63e0b..865612e 100644
--- a/src/actions/index.js
+++ b/src/actions/index.js
@@ -1,8 +1,18 @@
+// TODO: move to util lib
+function urlFromEnv(ext) {
+  if (process.env[ext]) {
+    return `${process.env.SERVER_ROOT}${process.env[ext]}`
+  } else {
+    return null
+  }
+}
+
 // TODO: relegate these URLs entirely to environment variables
-const EVENT_DATA_URL = `${process.env.SERVER_ROOT}${process.env.EVENT_EXT}`
-const CATEGORY_URL = `${process.env.SERVER_ROOT}${process.env.CATEGORY_EXT}`
-const TAG_TREE_URL = `${process.env.SERVER_ROOT}${process.env.TAG_TREE_EXT}`
-const SITES_URL = `${process.env.SERVER_ROOT}${process.env.SITES_EXT}`
+const EVENT_DATA_URL = urlFromEnv('EVENT_EXT')
+const CATEGORY_URL = urlFromEnv('CATEGORY_EXT')
+const TAG_URL = urlFromEnv('TAGS_EXT')
+const SOURCES_URL = urlFromEnv('SOURCES_EXT')
+const SITES_URL = urlFromEnv('SITES_EXT')
 const eventUrlMap = (event) => `${process.env.SERVER_ROOT}${process.env.EVENT_DESC_ROOT}/${(event.id) ? event.id : event}`
 
 /*
@@ -120,7 +130,11 @@ export function fetchSelected(selected) {
   }
   return dispatch => {
     dispatch(updateSelected(selected))
-    dispatch(toggleFetchingSources())
+    if (!SOURCES_URL) {
+      dispatch(fetchSourceError('No source extension specified.'))
+    } else {
+      dispatch(toggleFetchingSources())
+    }
 
     // const urls = events.map(eventUrlMap)
     // return Promise.all(
@@ -213,13 +227,6 @@ export function toggleFetchingSources() {
   }
 }
 
-// export const TOGGLE_FETCHING_EVENTS = 'TOGGLE_FETCHING_EVENTS'
-// export function toggleFetchingEvents() {
-//     return {
-//         type: TOGGLE_FETCHING_EVENTS
-//     }
-// }
-
 export const TOGGLE_LANGUAGE = 'TOGGLE_LANGUAGE';
 export function toggleLanguage(language) {
   return {
@@ -248,3 +255,13 @@ export function toggleNotifications() {
     type: TOGGLE_NOTIFICATIONS
   }
 }
+
+// ERRORS
+
+export const FETCH_SOURCE_ERROR = 'FETCH_SOURCE_ERROR'
+export function fetchSourceError(msg) {
+  return {
+    type: FETCH_SOURCE_ERROR,
+    msg
+  }
+}
diff --git a/src/reducers/ui.js b/src/reducers/ui.js
index 162102f..0a643c3 100644
--- a/src/reducers/ui.js
+++ b/src/reducers/ui.js
@@ -10,35 +10,43 @@ import {
 } from '../actions'
 
 function toggleFetchingDomain(uiState, action) {
-  return Object.assign({}, uiState, {
-    flags: Object.assign({}, uiState.flags, {
+  return {
+    ...uiState,
+    flags: {
+      ...uiState.flags,
       isFetchingDomain: !uiState.flags.isFetchingDomain
-    })
-  });
+    }
+  }
 }
 
 function toggleFetchingSources(uiState, action) {
-  return Object.assign({}, uiState, {
-    flags: Object.assign({}, uiState.flags, {
+  return {
+    ...uiState,
+    flags: {
+      ...uiState.flags,
       isFetchingSources: !uiState.flags.isFetchingSources
-    })
-  });
+    }
+  }
 }
 
 function toggleInfoPopup(uiState, action) {
-  return Object.assign({}, uiState, {
-    flags: Object.assign({}, uiState.flags, {
+  return {
+    ...uiState,
+    flags: {
+      ...uiState.flags,
       isInfopopup: !uiState.flags.isInfopopup
-    })
-  });
+    }
+  }
 }
 
 function toggleNotifications(uiState, action) {
-  return Object.assign({}, uiState, {
-    flags: Object.assign({}, uiState.flags, {
+  return {
+    ...uiState,
+    flags: {
+      ...uiState.flags,
       isNotification: !uiState.flags.isNotification
-    })
-  });
+    }
+  }
 }
 
 function ui(uiState = initial.ui, action) {
diff --git a/src/store/initial.js b/src/store/initial.js
index 5a3c03d..4d1912a 100644
--- a/src/store/initial.js
+++ b/src/store/initial.js
@@ -119,10 +119,10 @@ const initial = {
 
       narratives: {
         default: {
-          style: 'dotted',                  // ['dotted', 'solid']
-          opacity: 0.4,                     // range between 0 and 1
+          style: 'solid',                  // ['dotted', 'solid']
+          opacity: 0.9,                     // range between 0 and 1
           stroke: 'red',               // Any hex or rgb code
-          strokeWidth: 2
+          strokeWidth: 5
         },
         narrative_1: {
           style: 'solid',                  // ['dotted', 'solid']