diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2AWT3.java b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2AWT3.java
index 16c53564ce..94a58e3666 100644
--- a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2AWT3.java
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2AWT3.java
@@ -108,6 +108,8 @@ public void syncedOneAnimator(final boolean destroyCleanOrder) throws Interrupte
         final Frame f1 = new Frame();
         final Animator animator = new Animator();
         final GearsES2 g1 = new GearsES2(0);
+        // g1.setUseMappedBuffers(useMappedBuffers);
+        g1.setValidateBuffers(true);
         final GLCanvas c1 = createGLCanvas(f1, 0, 0, g1);
         animator.add(c1);
 
@@ -244,6 +246,9 @@ public void asyncEachOneAnimator(final boolean destroyCleanOrder) throws Interru
         final Frame f1 = new Frame();
         final Animator a1 = new Animator();
         final GearsES2 g1 = new GearsES2(0);
+        g1.setSyncObjects(g1); // this is master, since rendered we must use it as sync
+        // g1.setUseMappedBuffers(useMappedBuffers);
+        g1.setValidateBuffers(true);
         final GLCanvas c1 = createGLCanvas(f1, 0, 0, g1);
         a1.add(c1);
         a1.start();
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2AWT3b.java b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2AWT3b.java
index f6eb479fa9..5623fc2fa1 100644
--- a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2AWT3b.java
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2AWT3b.java
@@ -98,6 +98,8 @@ public void test01SyncedOneAnimator() throws InterruptedException, InvocationTar
         final Frame f1 = new Frame();
         final Animator animator = new Animator();
         final GearsES2 g1 = new GearsES2(0);
+        // g1.setUseMappedBuffers(useMappedBuffers);
+        g1.setValidateBuffers(true);
         final GLJPanel c1 = createGLJPanel(f1, 0, 0, g1);
         animator.add(c1);
 
@@ -196,6 +198,9 @@ public void test02AsyncEachAnimator() throws InterruptedException, InvocationTar
         final Frame f1 = new Frame();
         final Animator a1 = new Animator();
         final GearsES2 g1 = new GearsES2(0);
+        g1.setSyncObjects(g1); // this is master, since rendered we must use it as sync
+        // g1.setUseMappedBuffers(useMappedBuffers);
+        g1.setValidateBuffers(true);
         final GLJPanel c1 = createGLJPanel(f1, 0, 0, g1);
         a1.add(c1);
         a1.start();
diff --git a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2SWT3.java b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2SWT3.java
index 4e2457181b..332d799b26 100644
--- a/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2SWT3.java
+++ b/src/test/com/jogamp/opengl/test/junit/jogl/acore/TestSharedContextVBOES2SWT3.java
@@ -180,6 +180,8 @@ public void run() {
     public void test01SyncedOneAnimator() throws InterruptedException {
         final Animator animator = new Animator();
         final GearsES2 g1 = new GearsES2(0);
+        // g1.setUseMappedBuffers(useMappedBuffers);
+        g1.setValidateBuffers(true);
         final GLCanvas c1 = createGLCanvas(shell1, composite1, 0, 0, g1);
         animator.add(c1);
 
@@ -208,7 +210,7 @@ public void run() {
             public void run() {
                 if( !display.readAndDispatch() ) {
                     try {
-                        Thread.sleep(10);
+                        Thread.sleep(200);
                     } catch (final InterruptedException e) { }
                 }
             } };
@@ -268,6 +270,9 @@ public void run() {
     public void test02AsyncEachAnimator() throws InterruptedException {
         final Animator a1 = new Animator();
         final GearsES2 g1 = new GearsES2(0);
+        g1.setSyncObjects(g1); // this is master, since rendered we must use it as sync
+        // g1.setUseMappedBuffers(useMappedBuffers);
+        g1.setValidateBuffers(true);
         final GLCanvas c1 = createGLCanvas(shell1, composite1, 0, 0, g1);
         a1.add(c1);
         display.syncExec(new Runnable() {
@@ -280,7 +285,7 @@ public void run() {
             public void run() {
                 if( !display.readAndDispatch() ) {
                     try {
-                        Thread.sleep(10);
+                        Thread.sleep(200);
                     } catch (final InterruptedException e) { }
                 }
             } };