diff --git a/src/Umbraco.Core/Persistence/Repositories/MemberGroupRepository.cs b/src/Umbraco.Core/Persistence/Repositories/MemberGroupRepository.cs
index c7e8a5c328..455e2faf38 100644
--- a/src/Umbraco.Core/Persistence/Repositories/MemberGroupRepository.cs
+++ b/src/Umbraco.Core/Persistence/Repositories/MemberGroupRepository.cs
@@ -132,7 +132,7 @@ namespace Umbraco.Core.Persistence.Repositories
         public IMemberGroup GetByName(string name)
         {
             return IsolatedCache.GetCacheItem<IMemberGroup>(
-                string.Format("{0}.{1}", typeof (IMemberGroup).FullName, name),
+                string.Format("{0}.{1}", typeof(IMemberGroup).FullName, name),
                 () =>
                 {
                     var qry = new Query<IMemberGroup>().Where(group => group.Name.Equals(name));
@@ -140,7 +140,7 @@ namespace Umbraco.Core.Persistence.Repositories
                     return result.FirstOrDefault();
                 },
                 //cache for 5 mins since that is the default in the RuntimeCacheProvider
-                TimeSpan.FromMinutes(5), 
+                TimeSpan.FromMinutes(5),
                 //sliding is true
                 true);
         }
@@ -337,4 +337,4 @@ namespace Umbraco.Core.Persistence.Repositories
         /// </summary>
         internal static event TypedEventHandler<IMemberGroupRepository, SaveEventArgs<IMemberGroup>> SavedMemberGroup;
     }
-}
\ No newline at end of file
+}
diff --git a/src/Umbraco.Web/Cache/MemberGroupCacheRefresher.cs b/src/Umbraco.Web/Cache/MemberGroupCacheRefresher.cs
index 2d61b254a0..6d3ce6bb57 100644
--- a/src/Umbraco.Web/Cache/MemberGroupCacheRefresher.cs
+++ b/src/Umbraco.Web/Cache/MemberGroupCacheRefresher.cs
@@ -1,6 +1,6 @@
 using System;
 using System.Linq;
-using System.Web.Script.Serialization;
+using System.Web;
 using Newtonsoft.Json;
 using Umbraco.Core;
 using Umbraco.Core.Cache;
@@ -83,36 +83,28 @@ namespace Umbraco.Web.Cache
 
         public override void Refresh(string jsonPayload)
         {
-            ClearCache(DeserializeFromJsonPayload(jsonPayload));
+            ClearCache();
             base.Refresh(jsonPayload);
         }
 
         public override void Refresh(int id)
         {
-            ClearCache(FromMemberGroup(ApplicationContext.Current.Services.MemberGroupService.GetById(id)));
+            ClearCache();
             base.Refresh(id);
         }
 
         public override void Remove(int id)
         {
-            ClearCache(FromMemberGroup(ApplicationContext.Current.Services.MemberGroupService.GetById(id)));
+            ClearCache();
             base.Remove(id);
         }
 
-        private void ClearCache(params JsonPayload[] payloads)
+        private void ClearCache()
         {
-            if (payloads == null) return;
-
-            var memberGroupCache = ApplicationContext.Current.ApplicationCache.IsolatedRuntimeCache.GetCache<IMemberGroup>();
-            payloads.ForEach(payload =>
-            {
-                if (payload != null && memberGroupCache)
-                {
-                    memberGroupCache.Result.ClearCacheByKeySearch(string.Format("{0}.{1}", typeof(IMemberGroup).FullName, payload.Name));
-                    memberGroupCache.Result.ClearCacheItem(RepositoryBase.GetCacheIdKey<IMemberGroup>(payload.Id));
-                }                
-            });
-            
+            // Since we cache by group name, it could be problematic when renaming to
+            // previously existing names - see http://issues.umbraco.org/issue/U4-10846.
+            // To work around this, just clear all the cache items
+            ApplicationContext.Current.ApplicationCache.IsolatedRuntimeCache.ClearCache<IMemberGroup>();
         }
     }
-}
\ No newline at end of file
+}