diff --git a/stepmania/src/ActorUtil.cpp b/stepmania/src/ActorUtil.cpp
index 5f2d5d33bc..a067e3bbbd 100644
--- a/stepmania/src/ActorUtil.cpp
+++ b/stepmania/src/ActorUtil.cpp
@@ -118,7 +118,7 @@ Actor* ActorUtil::LoadFromActorFile( const CString& sAniDir, const XNode* pNode
 		CString expr;
 		if( pNode->GetAttrValue("Condition",expr) )
 		{
-			if( !LUA->RunExpressionB(expr) )
+			if( !LuaHelpers::RunExpressionB(expr) )
 				return NULL;
 		}
 	}
diff --git a/stepmania/src/BGAnimation.cpp b/stepmania/src/BGAnimation.cpp
index c0a8ab3202..7dfd5907d0 100644
--- a/stepmania/src/BGAnimation.cpp
+++ b/stepmania/src/BGAnimation.cpp
@@ -45,7 +45,7 @@ void BGAnimation::AddLayersFromAniDir( const CString &_sAniDir, const IniFile& i
 		CString expr;
 		if( ini.GetValue( "BGAnimation", "Condition", expr ) || ini.GetValue( "BGAnimation", "Cond", expr ) )
 		{
-			if( !LUA->RunExpressionB( expr ) )
+			if( !LuaHelpers::RunExpressionB( expr ) )
 				return;
 		}
 	}
@@ -73,7 +73,7 @@ void BGAnimation::AddLayersFromAniDir( const CString &_sAniDir, const IniFile& i
 				CString expr;
 				if( pKey->GetAttrValue("Condition",expr) )
 				{
-					if( !LUA->RunExpressionB( expr ) )
+					if( !LuaHelpers::RunExpressionB( expr ) )
 						continue;
 				}
 
diff --git a/stepmania/src/BGAnimationLayer.cpp b/stepmania/src/BGAnimationLayer.cpp
index 1fd9165eb7..e3f6b926a8 100644
--- a/stepmania/src/BGAnimationLayer.cpp
+++ b/stepmania/src/BGAnimationLayer.cpp
@@ -376,7 +376,7 @@ void BGAnimationLayer::LoadFromNode( const CString& sDir, const XNode* pNode )
 		CString expr;
 		if( pNode->GetAttrValue("Cond",expr) || pNode->GetAttrValue("Condition",expr) )
 		{
-			if( !LUA->RunExpressionB(expr) )
+			if( !LuaHelpers::RunExpressionB(expr) )
 				return;
 		}
 	}
@@ -668,7 +668,7 @@ bool BGAnimationLayer::EarlyAbortDraw()
 		return false;
 
 	// TODO: Is it ok to evaluate this every frame? 
-	if( !LUA->RunExpressionB(m_sDrawCond) )
+	if( !LuaHelpers::RunExpressionB(m_sDrawCond) )
 		return true;
 
 	return false;
diff --git a/stepmania/src/LuaManager.cpp b/stepmania/src/LuaManager.cpp
index e424ac3fe3..bd6cb5a5bc 100644
--- a/stepmania/src/LuaManager.cpp
+++ b/stepmania/src/LuaManager.cpp
@@ -300,10 +300,15 @@ bool LuaHelpers::RunScript( Lua *L, const CString &sExpression, const CString &s
 	return true;
 }
 
-bool LuaManager::RunExpressionB( const CString &str )
+bool LuaHelpers::RunExpressionB( const CString &str )
 {
+	Lua *L = LUA->Get();
+
 	if( !LuaHelpers::RunScript(L, "return " + str, "", 1) )
+	{
+		LUA->Release(L);
 		return false;
+	}
 
 	/* Don't accept a function as a return value. */
 	if( lua_isfunction( L, -1 ) )
@@ -311,6 +316,7 @@ bool LuaManager::RunExpressionB( const CString &str )
 
 	bool result = !!lua_toboolean( L, -1 );
 	lua_pop( L, 1 );
+	LUA->Release(L);
 
 	return result;
 }
diff --git a/stepmania/src/LuaManager.h b/stepmania/src/LuaManager.h
index 3594503e73..531067adca 100644
--- a/stepmania/src/LuaManager.h
+++ b/stepmania/src/LuaManager.h
@@ -60,7 +60,6 @@ public:
 	void ResetState();
 
 	/* Run an expression in the global environment, returning the given type. */
-	bool RunExpressionB( const CString &str );
 	float RunExpressionF( const CString &str );
 	int RunExpressionI( const CString &str );
 	bool RunExpressionS( const CString &str, CString &sOut );
@@ -104,6 +103,9 @@ namespace LuaHelpers
 	/* Read the table at the top of the stack back into a vector. */
 	void ReadArrayFromTableB( Lua *L, vector<bool> &aOut );
 
+	/* Run an expression in the global environment, returning the given type. */
+	bool RunExpressionB( const CString &str );
+
 	template<class T>
 	void ReadArrayFromTable( vector<T> &aOut, lua_State *L )
 	{
diff --git a/stepmania/src/ThemeManager.cpp b/stepmania/src/ThemeManager.cpp
index 6473850a7e..b075ea6ef9 100644
--- a/stepmania/src/ThemeManager.cpp
+++ b/stepmania/src/ThemeManager.cpp
@@ -739,7 +739,7 @@ bool ThemeManager::GetMetricB( const CString &sClassName, const CString &sValueN
 
 	LUA->PrepareExpression( sValue );
 	
-	return LUA->RunExpressionB( sValue );
+	return LuaHelpers::RunExpressionB( sValue );
 }
 
 RageColor ThemeManager::GetMetricC( const CString &sClassName, const CString &sValueName )