diff --git a/Source/Core/Common/BitField.h b/Source/Core/Common/BitField.h
index f7a0a0175c..8ec80de9c0 100644
--- a/Source/Core/Common/BitField.h
+++ b/Source/Core/Common/BitField.h
@@ -125,13 +125,29 @@ public:
 	// so that we can use this within unions
 	BitField() = default;
 
+#ifndef _WIN32
+	// We explicitly delete the copy assigment operator here, because the
+	// default copy assignment would copy the full storage value, rather than
+	// just the bits relevant to this particular bit field.
+	// Ideally, we would just implement the copy assignment to copy only the
+	// relevant bits, but this requires compiler support for unrestricted
+	// unions.
+	// MSVC 2013 has no support for this, hence we disable this code on
+	// Windows (so that the default copy assignment operator will be used).
+	// For any C++11 conformant compiler we delete the operator to make sure
+	// we never use this inappropriate operator to begin with.
+	// TODO: Implement this operator properly once all target compilers
+	// support unrestricted unions.
+	BitField& operator=(const BitField&) = delete;
+#endif
+
 	__forceinline BitField& operator=(T val)
 	{
 		storage = (storage & ~GetMask()) | ((val << position) & GetMask());
 		return *this;
 	}
 
-	__forceinline operator T() const
+	__forceinline T Value() const
 	{
 		if (std::numeric_limits<T>::is_signed)
 		{
@@ -144,6 +160,11 @@ public:
 		}
 	}
 
+	__forceinline operator T() const
+	{
+		return Value();
+	}
+
 private:
 	// StorageType is T for non-enum types and the underlying type of T if
 	// T is an enumeration. Note that T is wrapped within an enable_if in the
diff --git a/Source/Core/VideoCommon/VertexManagerBase.cpp b/Source/Core/VideoCommon/VertexManagerBase.cpp
index 5e44a5aa0e..84db7cffe8 100644
--- a/Source/Core/VideoCommon/VertexManagerBase.cpp
+++ b/Source/Core/VideoCommon/VertexManagerBase.cpp
@@ -154,7 +154,7 @@ void VertexManager::Flush()
 #if defined(_DEBUG) || defined(DEBUGFAST)
 	PRIM_LOG("frame%d:\n texgen=%d, numchan=%d, dualtex=%d, ztex=%d, cole=%d, alpe=%d, ze=%d", g_ActiveConfig.iSaveTargetId, xfmem.numTexGen.numTexGens,
 		xfmem.numChan.numColorChans, xfmem.dualTexTrans.enabled, bpmem.ztex2.op,
-		bpmem.blendmode.colorupdate, bpmem.blendmode.alphaupdate, bpmem.zmode.updateenable);
+		(int)bpmem.blendmode.colorupdate, (int)bpmem.blendmode.alphaupdate, (int)bpmem.zmode.updateenable);
 
 	for (unsigned int i = 0; i < xfmem.numChan.numColorChans; ++i)
 	{
@@ -175,8 +175,8 @@ void VertexManager::Flush()
 			xfmem.postMtxInfo[i].index, xfmem.postMtxInfo[i].normalize);
 	}
 
-	PRIM_LOG("pixel: tev=%d, ind=%d, texgen=%d, dstalpha=%d, alphatest=0x%x", bpmem.genMode.numtevstages+1, bpmem.genMode.numindstages,
-		bpmem.genMode.numtexgens, (u32)bpmem.dstalpha.enable, (bpmem.alpha_test.hex>>16)&0xff);
+	PRIM_LOG("pixel: tev=%d, ind=%d, texgen=%d, dstalpha=%d, alphatest=0x%x", (int)bpmem.genMode.numtevstages+1, (int)bpmem.genMode.numindstages,
+		(int)bpmem.genMode.numtexgens, (u32)bpmem.dstalpha.enable, (bpmem.alpha_test.hex>>16)&0xff);
 #endif
 
 	u32 usedtextures = 0;