diff --git a/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/register/RegisterGroupLayoutNode.java b/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/register/RegisterGroupLayoutNode.java
index 29ec2e7732d..0df27e05459 100644
--- a/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/register/RegisterGroupLayoutNode.java
+++ b/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/ui/viewmodel/register/RegisterGroupLayoutNode.java
@@ -34,6 +34,7 @@ import org.eclipse.dd.dsf.ui.viewmodel.AbstractVMProvider;
 import org.eclipse.dd.dsf.ui.viewmodel.IVMContext;
 import org.eclipse.dd.dsf.ui.viewmodel.VMDelta;
 import org.eclipse.dd.dsf.ui.viewmodel.dm.AbstractDMVMLayoutNode;
+import org.eclipse.dd.dsf.ui.viewmodel.update.VMCacheManager;
 import org.eclipse.debug.core.DebugException;
 import org.eclipse.debug.core.ILaunch;
 import org.eclipse.debug.core.model.IDebugTarget;
@@ -222,6 +223,8 @@ public class RegisterGroupLayoutNode extends AbstractExpressionLayoutNode<IRegis
             parent.addFlags(IModelDelta.CONTENT);
         } 
         else if (e instanceof IRegisters.IGroupsChangedDMEvent) {
+        	// flush the cache
+        	VMCacheManager.getVMCacheManager().flush(super.getVMProvider().getPresentationContext());
             // Create a delta that indicates all groups have changed
             parent.addFlags(IModelDelta.CONTENT);
         } 
diff --git a/plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/update/VMCache.java b/plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/update/VMCache.java
index eb2123e4e51..0f5d4a23187 100644
--- a/plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/update/VMCache.java
+++ b/plugins/org.eclipse.dd.dsf.ui/src/org/eclipse/dd/dsf/ui/viewmodel/update/VMCache.java
@@ -53,7 +53,7 @@ public abstract class VMCache
 		fData = new HashMap<IDMContext<?>, IDMData>();
 		fChildrenCounts.clear();
 		fChildren.clear();
-		fChildrenCounts.clear();
+		fHasChildren.clear();
 	}
 	
 	protected boolean useCache()