diff --git a/WickedEngine/Utility/dds.h b/WickedEngine/Utility/dds.h
index e45562f4f..b5092707c 100644
--- a/WickedEngine/Utility/dds.h
+++ b/WickedEngine/Utility/dds.h
@@ -807,14 +807,15 @@ namespace dds
 		// returns the size of a specific slice at a specific mip level in bytes
 		constexpr unsigned slice_pitch(unsigned mip) const
 		{
+			const unsigned long long bpe = bits_per_element();
 			const unsigned long long blocksize = block_size();
-			unsigned long long num_blocks_y = (width() + blocksize - 1) / blocksize;
-			unsigned long long num_elements_z = depth();
+			unsigned long long num_blocks_x = (width() + blocksize - 1) / blocksize;
+			unsigned long long num_blocks_y = (height() + blocksize - 1) / blocksize;
+			num_blocks_x >>= mip;
 			num_blocks_y >>= mip;
-			num_elements_z >>= mip;
+			num_blocks_x = num_blocks_x < 1 ? 1 : num_blocks_x;
 			num_blocks_y = num_blocks_y < 1 ? 1 : num_blocks_y;
-			num_elements_z = num_elements_z < 1 ? 1 : num_elements_z;
-			return unsigned(row_pitch(mip) * num_blocks_y * num_elements_z);
+			return unsigned(num_blocks_x * num_blocks_y * bpe / 8ull);
 		}
 	};
 
diff --git a/WickedEngine/wiRenderer.cpp b/WickedEngine/wiRenderer.cpp
index c17dff07d..e180e745a 100644
--- a/WickedEngine/wiRenderer.cpp
+++ b/WickedEngine/wiRenderer.cpp
@@ -4899,6 +4899,12 @@ void UpdateRenderData(
 		wi::profiler::EndRange(range);
 		device->EventEnd(cmd);
 	}
+	else if(vis.scene->impostors.GetCount() > 0 && vis.scene->objects.GetCount() == 0 && vis.scene->impostorBuffer.IsValid())
+	{
+		device->ClearUAV(&vis.scene->impostorBuffer, 0, cmd);
+		barrier_stack.push_back(GPUBarrier::Buffer(&vis.scene->impostorBuffer, ResourceState::UNORDERED_ACCESS, ResourceState::SHADER_RESOURCE | ResourceState::INDIRECT_ARGUMENT));
+		barrier_stack_flush(cmd);
+	}
 
 	// Meshlets:
 	if(vis.scene->instanceArraySize > 0 && vis.scene->meshletBuffer.IsValid())
diff --git a/WickedEngine/wiScene.cpp b/WickedEngine/wiScene.cpp
index 111c6ef43..124eaf46f 100644
--- a/WickedEngine/wiScene.cpp
+++ b/WickedEngine/wiScene.cpp
@@ -4109,7 +4109,7 @@ namespace wi::scene
 	}
 	void Scene::RunImpostorUpdateSystem(wi::jobsystem::context& ctx)
 	{
-		if (dt == 0)
+		if (instanceArrayMapped == nullptr)
 			return;
 
 		if (impostors.GetCount() > 0 && !impostorArray.IsValid())
diff --git a/WickedEngine/wiVersion.cpp b/WickedEngine/wiVersion.cpp
index 33dd8ddb9..6dc12d37b 100644
--- a/WickedEngine/wiVersion.cpp
+++ b/WickedEngine/wiVersion.cpp
@@ -9,7 +9,7 @@ namespace wi::version
 	// minor features, major updates, breaking compatibility changes
 	const int minor = 71;
 	// minor bug fixes, alterations, refactors, updates
-	const int revision = 602;
+	const int revision = 603;
 
 	const std::string version_string = std::to_string(major) + "." + std::to_string(minor) + "." + std::to_string(revision);