diff --git a/DDrawCompat/DDraw/Surfaces/PrimarySurface.cpp b/DDrawCompat/DDraw/Surfaces/PrimarySurface.cpp
index 97f332f..60dcc1c 100644
--- a/DDrawCompat/DDraw/Surfaces/PrimarySurface.cpp
+++ b/DDrawCompat/DDraw/Surfaces/PrimarySurface.cpp
@@ -52,6 +52,12 @@ namespace DDraw
 	{
 		LOG_FUNC("PrimarySurface::create", &dd, desc, surface);
 		DDraw::RealPrimarySurface::destroyDefaultPrimary();
+		if (g_primarySurface)
+		{
+			LOG_ONCE("Warning: suppressed an attempt to create multiple primary surfaces");
+			return LOG_RESULT(DDERR_UNSUPPORTED);
+		}
+
 		const auto& dm = DDraw::DirectDraw::getDisplayMode(*CompatPtr<IDirectDraw7>::from(&dd));
 		g_monitorRect = D3dDdi::KernelModeThunks::getAdapterInfo(*CompatPtr<IDirectDraw7>::from(&dd)).monitorInfo.rcMonitor;
 		g_monitorRect.right = g_monitorRect.left + dm.dwWidth;
diff --git a/DDrawCompat/DDraw/Surfaces/TagSurface.cpp b/DDrawCompat/DDraw/Surfaces/TagSurface.cpp
index 3dcb027..c8bc3b8 100644
--- a/DDrawCompat/DDraw/Surfaces/TagSurface.cpp
+++ b/DDrawCompat/DDraw/Surfaces/TagSurface.cpp
@@ -18,6 +18,7 @@ namespace DDraw
 		, m_fullscreenWindowStyle(0)
 		, m_fullscreenWindowExStyle(0)
 	{
+		LOG_FUNC("TagSurface::TagSurface", Compat::hex(origCaps), ddLcl);
 		m_ddInt.lpVtbl = &CompatVtable<IDirectDraw>::s_origVtable;
 		m_ddInt.lpLcl = ddLcl;
 		m_ddInt.dwIntRefCnt = 1;
@@ -25,6 +26,7 @@ namespace DDraw
 
 	TagSurface::~TagSurface()
 	{
+		LOG_FUNC("TagSurface::~TagSurface", m_ddInt.lpLcl);
 		setFullscreenWindow(nullptr);
 		g_ddObjects.erase(m_ddInt.lpLcl);
 	}