diff --git a/Builder/IISMainHandler/build.txt b/Builder/IISMainHandler/build.txt
index 6d706ee..721527c 100644
--- a/Builder/IISMainHandler/build.txt
+++ b/Builder/IISMainHandler/build.txt
@@ -1 +1 @@
-892
\ No newline at end of file
+896
\ No newline at end of file
diff --git a/Common/Common.csproj b/Common/Common.csproj
index 94fa863..562a994 100644
--- a/Common/Common.csproj
+++ b/Common/Common.csproj
@@ -103,6 +103,7 @@
     <Compile Include="dataobjects\User.cs" />
     <Compile Include="dataobjects\AccountSettings.cs" />
     <Compile Include="dataobjects\UserGroup.cs" />
+    <Compile Include="IComplexSqlObjectTableSpec.cs" />
     <Compile Include="IOutputParams.cs" />
     <Compile Include="ISqlObjectTableSpec.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
diff --git a/Common/IComplexSqlObjectTableSpec.cs b/Common/IComplexSqlObjectTableSpec.cs
new file mode 100644
index 0000000..a6a197b
--- /dev/null
+++ b/Common/IComplexSqlObjectTableSpec.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace FLocal.Common {
+	public interface IComplexSqlObjectTableSpec : ISqlObjectTableSpec {
+
+		void refreshSqlObjectAndRelated(int id);
+
+	}
+}
diff --git a/Common/dataobjects/Board.cs b/Common/dataobjects/Board.cs
index 8c9e5ea..b8fb7bc 100644
--- a/Common/dataobjects/Board.cs
+++ b/Common/dataobjects/Board.cs
@@ -11,7 +11,7 @@ using FLocal.Common.actions;
 namespace FLocal.Common.dataobjects {
 	public class Board : SqlObject<Board> {
 
-		public class TableSpec : ISqlObjectTableSpec {
+		public class TableSpec : IComplexSqlObjectTableSpec {
 			public const string TABLE = "Boards";
 			public const string FIELD_ID = "Id";
 			public const string FIELD_SORTORDER = "SortOrder";
@@ -27,6 +27,10 @@ namespace FLocal.Common.dataobjects {
 			public string name { get { return TABLE; } }
 			public string idName { get { return FIELD_ID; } }
 			public void refreshSqlObject(int id) { Refresh(id); }
+			public void refreshSqlObjectAndRelated(int id) {
+				Refresh(id);
+				LoadById(id).subBoards_Reset();
+			}
 		}
 
 		public class ReadMarkerTableSpec : ISqlObjectTableSpec {
diff --git a/Common/dataobjects/Category.cs b/Common/dataobjects/Category.cs
index 58f7587..e93001a 100644
--- a/Common/dataobjects/Category.cs
+++ b/Common/dataobjects/Category.cs
@@ -9,7 +9,7 @@ using System.Xml.Linq;
 namespace FLocal.Common.dataobjects {
 	public class Category : SqlObject<Category> {
 
-		public class TableSpec : ISqlObjectTableSpec {
+		public class TableSpec : IComplexSqlObjectTableSpec {
 			public const string TABLE = "Categories";
 			public const string FIELD_ID = "Id";
 			public const string FIELD_SORTORDER = "SortOrder";
@@ -19,6 +19,10 @@ namespace FLocal.Common.dataobjects {
 			public string name { get { return TABLE; } }
 			public string idName { get { return FIELD_ID; } }
 			public void refreshSqlObject(int id) { Refresh(id); }
+			public void refreshSqlObjectAndRelated(int id) {
+				Refresh(id);
+				LoadById(id).subBoards_Reset();
+			}
 		}
 
 		protected override ISqlObjectTableSpec table { get { return TableSpec.instance; } }
diff --git a/IISMainHandler/handlers/request/maintenance/CleanCacheHandler.cs b/IISMainHandler/handlers/request/maintenance/CleanCacheHandler.cs
index 8976087..b096b6f 100644
--- a/IISMainHandler/handlers/request/maintenance/CleanCacheHandler.cs
+++ b/IISMainHandler/handlers/request/maintenance/CleanCacheHandler.cs
@@ -23,9 +23,13 @@ namespace FLocal.IISHandler.handlers.request.maintenance {
 			int start = int.Parse(context.httprequest.Form["start"]);
 			int length = int.Parse(context.httprequest.Form["length"]);
 			ISqlObjectTableSpec tableSpec = TableManager.TABLES[table];
-			for(int i=0; i<length; i++) {
+			foreach(int id in Enumerable.Range(start, length)) {
 				try {
-					tableSpec.refreshSqlObject(start+i);
+					if(tableSpec is IComplexSqlObjectTableSpec) {
+						((IComplexSqlObjectTableSpec)tableSpec).refreshSqlObjectAndRelated(id);
+					} else {
+						tableSpec.refreshSqlObject(id);
+					}
 				} catch(NotFoundInDBException) {
 				}
 			}