diff --git a/ci/before_install.sh b/ci/before_install.sh
index 9de65ca679..2b127c9f58 100755
--- a/ci/before_install.sh
+++ b/ci/before_install.sh
@@ -67,6 +67,8 @@ then
   lldb --help
   cmake --version
   man lldb
+  cat /System/Library/Frameworks/JavaScriptCore.framework/Resources/Info.plist
+  cat /System/Library/Frameworks/JavaScriptCore.framework/Resources/version.plist
 fi
 
 #install lighttpd, code coverage binaries for mac
diff --git a/ci/build_linux.sh b/ci/build_linux.sh
index 507737986e..1e52554902 100755
--- a/ci/build_linux.sh
+++ b/ci/build_linux.sh
@@ -27,7 +27,7 @@ export PKG_CONFIG_PATH=$TRAVIS_BUILD_DIR/examples/pxScene2d/external/extlibs/lib
 if [ "$TRAVIS_PULL_REQUEST" = "false" ]
 then
 	echo "************************* Generating config files *************************" >> $BUILDLOGS
-	cmake -DPREFER_SYSTEM_LIBRARIES=ON -DPREFER_PKGCONFIG=ON -DPREFER_EXTERNAL_GIF=ON -DSPARK_ENABLE_VIDEO=ON -DBUILD_PX_TESTS=ON -DBUILD_PXSCENE_STATIC_LIB=ON -DBUILD_DEBUG_METRICS=ON -DPXSCENE_TEST_HTTP_CACHE=ON .. >>$BUILDLOGS 2>&1;
+	cmake -DSUPPORT_JSC=OFF -DPREFER_SYSTEM_LIBRARIES=ON -DPREFER_PKGCONFIG=ON -DPREFER_EXTERNAL_GIF=ON -DSPARK_ENABLE_VIDEO=ON -DBUILD_PX_TESTS=ON -DBUILD_PXSCENE_STATIC_LIB=ON -DBUILD_DEBUG_METRICS=ON -DPXSCENE_TEST_HTTP_CACHE=ON .. >>$BUILDLOGS 2>&1;
 	checkError $? "cmake config failed" "Config error" "Check the error in $BUILDLOGS"
 
   echo "************************* Building pxcore,rtcore,pxscene app,libpxscene, unitttests ****" >> $BUILDLOGS
@@ -36,7 +36,7 @@ then
 
 else
   echo "************************* Generating config files ****"
-  cmake -DPREFER_SYSTEM_LIBRARIES=ON -DPREFER_PKGCONFIG=ON -DPREFER_EXTERNAL_GIF=ON -DSPARK_ENABLE_VIDEO=ON -DBUILD_PX_TESTS=ON -DBUILD_PXSCENE_STATIC_LIB=ON -DBUILD_DEBUG_METRICS=ON -DPXSCENE_TEST_HTTP_CACHE=ON .. 1>>$BUILDLOGS;
+  cmake -DSUPPORT_JSC=OFF -DPREFER_SYSTEM_LIBRARIES=ON -DPREFER_PKGCONFIG=ON -DPREFER_EXTERNAL_GIF=ON -DSPARK_ENABLE_VIDEO=ON -DBUILD_PX_TESTS=ON -DBUILD_PXSCENE_STATIC_LIB=ON -DBUILD_DEBUG_METRICS=ON -DPXSCENE_TEST_HTTP_CACHE=ON .. 1>>$BUILDLOGS;
   checkError $? "cmake config failed" "Config error" "Check the errors displayed in this window"
 
 	echo "************************* Building pxcore,rtcore,pxscene app,libpxscene, unitttests ********"
diff --git a/ci/execute_osx.sh b/ci/execute_osx.sh
index df86c67ec3..2bb36f4d3c 100755
--- a/ci/execute_osx.sh
+++ b/ci/execute_osx.sh
@@ -57,6 +57,13 @@ printExecLogs()
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 
 # Start testRunner ...
+sparkPlatform=$1
+if [ "$sparkPlatform" = "jsc" ]; then
+export SPARK_USE_JSC=1
+  echo "Running under JSC Platform"
+else
+  echo "Running under Node Platform"
+fi
 rm -rf /var/tmp/spark.log
 cd $TRAVIS_BUILD_DIR/examples/pxScene2d/src/spark.app/Contents/MacOS
 ./spark.sh -enableVideo=false $TESTRUNNERURL?tests=$TESTS &
@@ -155,6 +162,7 @@ fi
 echo "Sleeping to make terminate complete ...";
 sleep 90s
 pkill -9 -f spark.sh	
+pkill -9 -f Spark
 
 cp /var/tmp/spark.log $EXECLOGS
 if [ "$dumped_core" -eq 1 ]
diff --git a/ci/script.sh b/ci/script.sh
index 64f051fd0a..5018c2ebe1 100755
--- a/ci/script.sh
+++ b/ci/script.sh
@@ -73,9 +73,15 @@ then
   sh "unittests_$TRAVIS_OS_NAME.sh" 
   checkError $? "#### Build/unittests/execution [unittests_$TRAVIS_OS_NAME.sh] failed" "Either build problem/execution problem" "Analyze corresponding log file"
 
-  sh "execute_$TRAVIS_OS_NAME.sh" 
-  checkError $? "#### Build/unittests/execution [execute_$TRAVIS_OS_NAME.sh] failed" "Either build problem/execution problem" "Analyze corresponding log file"
+  if [ "$TRAVIS_OS_NAME" = "osx" ]
+  then
+    sh "execute_$TRAVIS_OS_NAME.sh" "jsc"
+    checkError $? "#### Build/unittests/execution jsc platform [execute_$TRAVIS_OS_NAME.sh] failed" "Either build problem/execution problem" "Analyze corresponding log file"
+  fi
 
+  sh "execute_$TRAVIS_OS_NAME.sh" "node"
+  checkError $? "#### Build/unittests/execution node platform [execute_$TRAVIS_OS_NAME.sh] failed" "Either build problem/execution problem" "Analyze corresponding log file"
+  
   sh "code_coverage_$TRAVIS_OS_NAME.sh"
   checkError $? "#### Build/unittests/execution [code_coverage_$TRAVIS_OS_NAME.sh] failed" "Either build problem/execution problem" "Analyze corresponding log file"
 
diff --git a/examples/pxScene2d/src/pxResource.cpp b/examples/pxScene2d/src/pxResource.cpp
index c6e0e3c77e..fe4212a939 100644
--- a/examples/pxScene2d/src/pxResource.cpp
+++ b/examples/pxScene2d/src/pxResource.cpp
@@ -398,7 +398,7 @@ void rtImageResource::textureReady()
 int32_t rtImageResource::w() const
 {
   //rtLogDebug("tImageResource::w()\n");
-  if(mTexture.getPtr())
+  if(!downloadInProgress() && mTexture.getPtr())
     return mTexture->width();
   else
     return 0;
@@ -406,7 +406,7 @@ int32_t rtImageResource::w() const
 rtError rtImageResource::w(int32_t& v) const
 {
   //rtLogDebug("tImageResource::w(int32_t)\n");
-  if(mTexture.getPtr())
+  if(!downloadInProgress() && mTexture.getPtr())
     v = mTexture->width();
   else
     v = 0;
diff --git a/examples/pxScene2d/src/rcvrcore/initGL.js b/examples/pxScene2d/src/rcvrcore/initGL.js
index ec78aa0375..9f79594e78 100644
--- a/examples/pxScene2d/src/rcvrcore/initGL.js
+++ b/examples/pxScene2d/src/rcvrcore/initGL.js
@@ -297,9 +297,18 @@ function onSceneTerminate() {
   // memory leak fix
   this.sandbox.sparkscene.api = null;
 
-  for (var k in this.sandbox)
-  {
-    delete this.sandbox[k];
+  if (isJSC) {
+    var script = new vm.Script(
+      "for (var key in this) { delete this[key]; }"
+    );
+    script.runInContext(this.sandbox);
+    script = null;
+  }
+  else {
+    for (var k in this.sandbox)
+    {
+      delete this.sandbox[k];
+    }
   }
 
   this.contextifiedSandbox = null;
diff --git a/src/rtScriptJSC/rtJSCBindings.cpp b/src/rtScriptJSC/rtJSCBindings.cpp
index a225389e3e..63d06c81f0 100644
--- a/src/rtScriptJSC/rtJSCBindings.cpp
+++ b/src/rtScriptJSC/rtJSCBindings.cpp
@@ -182,7 +182,7 @@ static JSValueRef requireCallback(JSContextRef ctx, JSObjectRef, JSObjectRef thi
       return moduleObj;
     }
 
-    rtLogInfo("Loading %s", path.cString());
+    rtLogDebug("Loading %s", path.cString());
     std::string codeStr = readFile(path.cString());
     if (codeStr.empty()) {
       JSStringRelease(reqArgStr);
diff --git a/src/rtScriptJSC/rtJSCWrappers.cpp b/src/rtScriptJSC/rtJSCWrappers.cpp
index 91a5926b88..cde57ca372 100644
--- a/src/rtScriptJSC/rtJSCWrappers.cpp
+++ b/src/rtScriptJSC/rtJSCWrappers.cpp
@@ -271,12 +271,12 @@ static bool rtObjectWrapper_setProperty(JSContextRef context, JSObjectRef thisOb
   }
 
   rtValue val;
+  rtString name = jsToRtString(propertyName);
   if (jsToRt(context, value, val, exception) != RT_OK) {
     printException(context, *exception);
     return false;
   }
 
-  rtString name = jsToRtString(propertyName);
   rtError e = objectRef.set(name, val);
   if (e != RT_OK) {
     rtLogDebug("Failed to set property: %s", name.cString());
@@ -351,7 +351,6 @@ static bool rtObjectWrapper_hasProperty(JSContextRef ctx, JSObjectRef object, JS
   {
     rtMethodMap* objMap = objectRef->getMap();
     const char* className = objMap ? objMap->className : "<unknown>";
-    printf("rtObjectWrapper_hasProperty class=%s prop=%s\n", className, propName.cString());
   }
 
   if ( !strcmp(propName.cString(), "Symbol.iterator") ||
@@ -973,6 +972,11 @@ rtError JSObjectWrapper::Get(uint32_t i, rtValue* value) const
     return RT_ERROR_INVALID_ARG;
   JSValueRef exc = nullptr;
   JSValueRef valueRef = JSObjectGetPropertyAtIndex(context(), wrapped(), i, &exc);
+  
+  if (JSValueGetType(context(), valueRef) == kJSTypeUndefined)
+  {
+    return RT_PROPERTY_NOT_FOUND;
+  }
   if (exc) {
     printException(context(), exc);
     return RT_FAIL;
@@ -993,7 +997,8 @@ rtError JSObjectWrapper::Set(const char* name, const rtValue* value)
     return RT_FAIL;
   }
   if (!name || !value)
-    return RT_FAIL;
+    return RT_ERROR_INVALID_ARG;
+
   if (m_isArray)
     return RT_PROP_NOT_FOUND;
   JSValueRef valueRef = rtToJs(context(), *value);
@@ -1012,7 +1017,7 @@ rtError JSObjectWrapper::Set(uint32_t i, const rtValue* value)
 {
   RtJSC::assertIsMainThread();
   if (!value)
-    return RT_FAIL;
+    return RT_ERROR_INVALID_ARG;
   JSValueRef valueRef = rtToJs(context(), *value);
   JSValueRef exc = nullptr;
   JSObjectSetPropertyAtIndex(context(), wrapped(), i, valueRef, &exc);
diff --git a/src/rtScriptJSC/rtScriptJSC.cpp b/src/rtScriptJSC/rtScriptJSC.cpp
index 705fae442c..1dc13a3f66 100644
--- a/src/rtScriptJSC/rtScriptJSC.cpp
+++ b/src/rtScriptJSC/rtScriptJSC.cpp
@@ -267,7 +267,7 @@ class rtJSCContext: public RefCounted<rtIScriptContext>
 
 rtJSCContext::rtJSCContext()
 {
-  rtLogInfo("%s", __FUNCTION__);
+  rtLogInfo("%s %p\n", __FUNCTION__, this);
   m_contextGroup = JSContextGroupRetain(globalContextGroup());
   m_context = JSGlobalContextCreateInGroup(m_contextGroup, nullptr);
   m_priv = rtJSCContextPrivate::create(m_context);
@@ -294,11 +294,16 @@ rtJSCContext::rtJSCContext()
 
 rtJSCContext::~rtJSCContext()
 {
-  rtLogInfo("%s begin", __FUNCTION__);
+  rtLogInfo("%s %p begin", __FUNCTION__, this);
 
   if (gTopLevelContext == m_context)
+  {
+    if (gTopLevelContext != nullptr) {
+      JSSynchronousGarbageCollectForDebugging(gTopLevelContext);
+    }
     gTopLevelContext = nullptr;
-
+  }
+  
 //  RtJSC::dispatchOnMainLoop([m_priv=m_priv,m_context=m_context,m_contextGroup=m_contextGroup] {
 //  static JSStringRef codeStr = JSStringCreateWithUTF8CString("console.clear(); delete global.console");
 //  JSEvaluateScript(m_context, codeStr, nullptr, nullptr, 0, nullptr);
@@ -476,8 +481,7 @@ rtError rtScriptJSC::pump()
 rtError rtScriptJSC::collectGarbage()
 {
   if (gTopLevelContext) {
-    JSGarbageCollect(gTopLevelContext);
-    // JSSynchronousGarbageCollectForDebugging(gTopLevelContext);
+    JSSynchronousGarbageCollectForDebugging(gTopLevelContext);
   }
   return RT_OK;
 }
diff --git a/tests/pxScene2d/pxscene2dtests.sh b/tests/pxScene2d/pxscene2dtests.sh
index 55f6872064..ad4b8b8318 100755
--- a/tests/pxScene2d/pxscene2dtests.sh
+++ b/tests/pxScene2d/pxscene2dtests.sh
@@ -53,6 +53,8 @@ export SPARK_PERMISSIONS_ENABLED=true
 ln -s ../../examples/pxScene2d/src/shell.js shell.js
 ln -s ../../examples/pxScene2d/src/init.js init.js
 ln -s ../../examples/pxScene2d/src/node_modules/ node_modules
+ln -s ../../examples/pxScene2d/src/jsc_modules/ jsc_modules
+ln -s ../../examples/pxScene2d/src/v8_modules/ v8_modules
 ln -s ../../examples/pxScene2d/src/rcvrcore/ rcvrcore
 ln -s ../../examples/pxScene2d/src/FreeSans.ttf FreeSans.ttf
 ln -s ../../examples/pxScene2d/src/package.json package.json
@@ -66,6 +68,8 @@ ${DBG} ./pxscene2dtests "$@"
 rm -rf shell.js
 rm -rf init.js
 rm -rf node_modules
+rm -rf jsc_modules
+rm -rf v8_modules
 rm -rf rcvrcore
 rm -rf FreeSans.ttf
 rm -rf package.json
diff --git a/tests/pxScene2d/test_memoryleak.cpp b/tests/pxScene2d/test_memoryleak.cpp
index 462b69a52c..4a2be1f18d 100644
--- a/tests/pxScene2d/test_memoryleak.cpp
+++ b/tests/pxScene2d/test_memoryleak.cpp
@@ -114,6 +114,7 @@ class pxSceneContainerLeakTest : public testing::Test
       sceneContainer->AddRef();
       sceneContainer->remove();
       script.collectGarbage();
+      process();
       EXPECT_TRUE (sceneptr->isObjectTracked(sceneContainer) == false);
       sceneContainer->Release();
     }
diff --git a/tests/pxScene2d/test_rtnode.cpp b/tests/pxScene2d/test_rtnode.cpp
index 32bfbcb1f9..7b98c1a0a8 100644
--- a/tests/pxScene2d/test_rtnode.cpp
+++ b/tests/pxScene2d/test_rtnode.cpp
@@ -31,7 +31,7 @@ TEST(pxScene2dTests, rtNodeTests)
 {
     // Create rtNode
     extern rtScript script;
-
+    if (script.engine().compare("node/v8") == 0) {
     //v8::Isolate *isolate = script.getIsolate();
 
     // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -210,4 +210,8 @@ TEST(pxScene2dTests, rtNodeTests)
     EXPECT_TRUE((t2 < (t1 / 4)) == true);
 
     // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+    }
+    else {
+      EXPECT_TRUE(true);
+    }
 }