diff --git a/NEWS b/NEWS
index cbff4c84d..dd9490652 100644
--- a/NEWS
+++ b/NEWS
@@ -30,6 +30,7 @@ Bug fixes
  - [web] fixed missing CC or BCC when specified before sending message (#3944)
  - [web] enabled Save button after deleting attributes from a card (#4095)
  - [web] don't show Copy To and Move To menu options when user has a single address book
+ - [web] fixed display of category colors in events and tasks lists
  - [eas] fixed opacity in EAS freebusy (#4033)
 
 3.2.7 (2017-02-14)
diff --git a/UI/WebServerResources/js/Scheduler/Component.service.js b/UI/WebServerResources/js/Scheduler/Component.service.js
index 34ca4fe54..8fcf20408 100644
--- a/UI/WebServerResources/js/Scheduler/Component.service.js
+++ b/UI/WebServerResources/js/Scheduler/Component.service.js
@@ -316,10 +316,6 @@
         componentData.hour = start.getHourString();
         componentData.blocks = [];
         component = new Component(componentData);
-        // Filter out categories for which there's no associated color
-        component.categories = _.filter(component.categories, function(name) {
-          return Component.$Preferences.defaults.SOGoCalendarCategoriesColors[name];
-        });
         objects.push(component);
         return objects;
       };
@@ -437,10 +433,6 @@
         _.reduce(data[type], function(components, componentData, i) {
           var data = _.zipObject(fields, componentData), component;
           component = new Component(data);
-          // Filter out categories for which there's no associated color
-          component.categories = _.filter(component.categories, function(name) {
-            return Component.$Preferences.defaults.SOGoCalendarCategoriesColors[name];
-          });
           components.push(component);
           return components;
         }, components);
@@ -539,8 +531,15 @@
     else if (this.type == 'task')
       this.completed = new Date();
 
-    if (this.c_category)
-      this.categories = _.invokeMap(this.c_category, 'asCSSIdentifier');
+    if (this.c_category) {
+      // c_category is only defined in list mode (when calling $filter)
+      Component.$Preferences.ready().then(function() {
+        // Filter out categories for which there's no associated color
+        _this.categories = _.invokeMap(_.filter(_this.c_category, function(name) {
+          return Component.$Preferences.defaults.SOGoCalendarCategoriesColors[name];
+        }), 'asCSSIdentifier');
+      });
+    }
 
     // Parse recurrence rule definition and initialize default values
     this.$isRecurrent = angular.isDefined(data.repeat);