diff --git a/openVulkanoCpp/AR/Provider/ArKit/ArSessionArKitInternal.mm b/openVulkanoCpp/AR/Provider/ArKit/ArSessionArKitInternal.mm
index a0dec5a..f2a8d8b 100644
--- a/openVulkanoCpp/AR/Provider/ArKit/ArSessionArKitInternal.mm
+++ b/openVulkanoCpp/AR/Provider/ArKit/ArSessionArKitInternal.mm
@@ -176,7 +176,7 @@ namespace OpenVulkano::AR::ArKit
 	void ArSessionArKitInternal::OnArSessionFailed(ARSession* session, NSError* error)
 	{
 		VALIDATE_SESSION(session);
-		Logger::AR->warn("AR Session failed, description: {}", [[error description] UTF8String]);
+		Logger::AR->warn("Ar session failed, description: {}", [[error description] UTF8String]);
 		std::string failReason = [[error localizedDescription] UTF8String];
 		OnSessionFailed(failReason);
 	}
@@ -184,7 +184,9 @@ namespace OpenVulkano::AR::ArKit
 	void ArSessionArKitInternal::OnArCameraTrackingChange(ARSession* session, ARCamera* camera)
 	{
 		VALIDATE_SESSION(session);
-		OnTrackingStateChanged(GetArTrackingState(camera));
+		auto trackingState = GetArTrackingState(camera);
+		Logger::AR->info("Ar session tracking state changed: {}", trackingState.GetName());
+		OnTrackingStateChanged(trackingState);
 	}
 
 	void ArSessionArKitInternal::OnArAnchorsUpdate(NSArray<__kindof ARAnchor*>* anchors)
diff --git a/openVulkanoCpp/Base/Event.hpp b/openVulkanoCpp/Base/Event.hpp
index 82035ee..6fb12ba 100644
--- a/openVulkanoCpp/Base/Event.hpp
+++ b/openVulkanoCpp/Base/Event.hpp
@@ -279,7 +279,7 @@ namespace OpenVulkano
 			RegisterName(name);
 		}
 
-		Event(const Event& event) = default;
+		Event(const Event& event) = delete;
 
 		Event(Event&& event) = default;
 
@@ -297,10 +297,10 @@ namespace OpenVulkano
 					handler->Notify(args...);
 			}
 		}
-
-		void operator()(Arguments&&... args) const
+		
+		void operator()(Arguments... args) const
 		{
-			NotifyAll(std::forward<Arguments>(args)...);
+			NotifyAll(args...);
 		}
 
 		IEventHandler* RegisterName(const std::string& name)
diff --git a/openVulkanoCpp/Base/Observable.hpp b/openVulkanoCpp/Base/Observable.hpp
new file mode 100644
index 0000000..6df40ad
--- /dev/null
+++ b/openVulkanoCpp/Base/Observable.hpp
@@ -0,0 +1,8 @@
+//
+// Created by georg on 2024-04-24.
+//
+
+#ifndef MADVOXEL_SCANAPP_OBSERVABLE_HPP
+#define MADVOXEL_SCANAPP_OBSERVABLE_HPP
+
+#endif //MADVOXEL_SCANAPP_OBSERVABLE_HPP