Index: Microsoft.Build.Tasks/Microsoft.Build.Tasks/ManagedCompiler.cs
===================================================================
--- Microsoft.Build.Tasks/Microsoft.Build.Tasks/ManagedCompiler.cs      (revision 66109)
+++ Microsoft.Build.Tasks/Microsoft.Build.Tasks/ManagedCompiler.cs      (working copy)
@@ -76,7 +76,12 @@
                                commandLine.AppendSwitchIfNotNull ("/out:", OutputAssembly.ItemSpec);
                        if (References != null) {
                                foreach (ITaskItem item in References) {
-                                       commandLine.AppendSwitchIfNotNull ("/reference:", item.ItemSpec);
+                                       string reference = item.ItemSpec;
+                                       if (!String.IsNullOrEmpty(item.GetMetadata("HintPath")))
+                                       {
+                                               reference = item.GetMetadata("HintPath");
+                                       }
+                                       commandLine.AppendSwitchIfNotNull ("/reference:", reference);
                                }
                        }
                        if (Resources != null) {
Index: Microsoft.Build.Tasks/Microsoft.Build.Tasks/Csc.cs
===================================================================
--- Microsoft.Build.Tasks/Microsoft.Build.Tasks/Csc.cs  (revision 66109)
+++ Microsoft.Build.Tasks/Microsoft.Build.Tasks/Csc.cs  (working copy)
@@ -44,7 +44,7 @@
                protected internal override void AddResponseFileCommands (CommandLineBuilderExtension commandLine)
                {
                        base.AddResponseFileCommands (commandLine);
-
+
                        if (AllowUnsafeBlocks == true)
                                commandLine.AppendSwitch ("/unsafe");
                        //baseAddress
Index: Microsoft.Build.Engine/Microsoft.Build.BuildEngine/ExpressionCollection.cs
===================================================================
--- Microsoft.Build.Engine/Microsoft.Build.BuildEngine/ExpressionCollection.cs (revision 66109)
+++ Microsoft.Build.Engine/Microsoft.Build.BuildEngine/ExpressionCollection.cs (working copy)
@@ -128,7 +128,14 @@
                object ConvertToObject (string raw, Type type)
                {
                        if (type == typeof (bool)) {
-                               return Boolean.Parse (raw);
+                               if (!String.IsNullOrEmpty(raw))
+                               {
+                                       return Boolean.Parse (raw);
+                               }
+                               else
+                               {
+                                       return false;
+                               }
                        } else if (type == typeof (string)) {
                                return raw;
                        } else if (type == typeof (int)) {