reset dropbox client on change

app/scripts/comp/dropbox-link.js

@@ -264,6 +264,10 @@ var DropboxLink = {
         this._getClient(function(err) { complete(err); }, overrideAppKey);
     },
 
+    resetClient: function() {
+        this._dropboxClient = null;
+    },
+
     receive: function() {
         Dropbox.AuthDriver.Popup.oauthReceiver();
     },

app/scripts/storage/storage-dropbox.js

@@ -110,6 +110,7 @@ var StorageDropbox = {
                     dropboxAppKey: config.key,
                     dropboxFolder: config.folder
                 });
+                DropboxLink.resetClient();
             }
             callback(err);
         }, config.key);
@@ -129,7 +130,10 @@ var StorageDropbox = {
                     case 'custom':
                         value = '(your app key)';
                         break;
+                    default:
+                        return;
                 }
+                DropboxLink.resetClient();
                 break;
             case 'key':
                 key = 'dropboxAppKey';
@@ -201,7 +205,8 @@ var StorageDropbox = {
                             rev: f.versionTag
                         };
                     });
-                var dir = dirStat.inAppFolder ? Locale.openAppFolder : UrlUtils.trimStartSlash(dirStat.path);
+                var dir = dirStat.inAppFolder ? Locale.openAppFolder :
+                    (UrlUtils.trimStartSlash(dirStat.path) || Locale.openRootFolder);
                 callback(null, fileList, dir);
             });
         });

app/scripts/util/locale.js

@@ -120,6 +120,7 @@ var Locale = {
     openNothingFound: 'Nothing found',
     openNothingFoundBody: 'No files which could be opened (files are searched inside {} folder).',
     openAppFolder: 'app',
+    openRootFolder: 'root',
     openSelectFile: 'Select a file',
     openSelectFileBody: 'Select a file which you would like to open',
     openPassFor: 'Password for',