Index: branches/comu-ver2/data/class/db/SC_DB_MasterData.php
===================================================================
--- branches/comu-ver2/data/class/db/SC_DB_MasterData.php	(revision 18571)
+++ branches/comu-ver2/data/class/db/SC_DB_MasterData.php	(revision 18655)
@@ -227,4 +227,8 @@
     function clearCache($name) {
         $masterDataFile = MASTER_DATA_DIR . $name . ".php";
+        if (is_file($masterDataFile)) {
+            unlink($masterDataFile);
+        }
+        $masterDataFile = MASTER_DATA_DIR . $name . ".serial";
         if (is_file($masterDataFile)) {
             unlink($masterDataFile);