diff --git a/MarketDataLib/Cache/LocalPriceCache.cs b/MarketDataLib/Cache/LocalPriceCache.cs
index 4130bd9..5cd654d 100644
--- a/MarketDataLib/Cache/LocalPriceCache.cs
+++ b/MarketDataLib/Cache/LocalPriceCache.cs
@@ -60,7 +60,6 @@ namespace MarketData.Cache
         if(null==instance)
         {
           instance=new LocalPriceCache();
-          instance.RefreshLatestDate();
         }
         return instance;
       }
@@ -78,6 +77,10 @@ namespace MarketData.Cache
     {
       lock(typeof(LocalPriceCache))
       {
+        if(Utility.IsEpoch(latestDate))
+        {
+          RefreshLatestDate();
+        }
         return latestDate;
       }
     }
diff --git a/MarketDataLib/Generator/MGSHMomentum/MGSHSessionManager.cs b/MarketDataLib/Generator/MGSHMomentum/MGSHSessionManager.cs
index 6596de5..376b8d1 100644
--- a/MarketDataLib/Generator/MGSHMomentum/MGSHSessionManager.cs
+++ b/MarketDataLib/Generator/MGSHMomentum/MGSHSessionManager.cs
@@ -7,11 +7,11 @@ using StopLimits=MarketData.Generator.Model.StopLimits;
 namespace MarketData.Generator.MGSHMomentum
 {
 // *****************************************************************************
-  public class MGSHSessionManager
+  public static class MGSHSessionManager
   {
     private const String SIGNATURE="MGSHSESSIONv2.00";
 
-    public bool SaveSession(MGSHSessionParams sessionParams,String pathSessionFile)
+    public static bool SaveSession(MGSHSessionParams sessionParams,String pathSessionFile)
     {
       try
       {