Use MapLog to keep track of the top screen. It's a bit buried in the crashinfo.txt, but still there.

stepmania/src/ActorUtil.h

@@ -6,11 +6,6 @@
 #include "Actor.h"
 #include "RageTexture.h"
 
-namespace StepMania
-{
-	RString GetTopScreenName();
-}
-
 class XNode;
 
 typedef Actor* (*CreateActorFn)();
@@ -51,8 +46,7 @@ namespace ActorUtil
 	inline void PlayCommand( Actor& actor, const RString &sCommandName ) { actor.PlayCommand( sCommandName ); }
 	inline void OnCommand( Actor& actor )
 	{
-		ASSERT_M( actor.HasCommand("On"), ssprintf("%s is missing an OnCommand. Top Screen is %s.",
-							   actor.GetName().c_str(), StepMania::GetTopScreenName().c_str()) );
+		ASSERT_M( actor.HasCommand("On"), ssprintf("%s is missing an OnCommand.", actor.GetName().c_str()) );
 		actor.PlayCommand("On");
 	}
 	inline void OffCommand( Actor& actor )
@@ -63,8 +57,7 @@ namespace ActorUtil
 		// (Do "playcommand" anyway; BGAs often have no name.)
 		if( actor.GetName().empty() )
 			return;
-		ASSERT_M( actor.HasCommand("Off"), ssprintf("Actor %s is missing an OffCommand. Top Screen is %s.",
-							    actor.GetName().c_str(), StepMania::GetTopScreenName().c_str()) );
+		ASSERT_M( actor.HasCommand("Off"), ssprintf("Actor %s is missing an OffCommand.", actor.GetName().c_str()) );
 		actor.PlayCommand("Off");
 	}
 

stepmania/src/ScreenManager.cpp

@@ -116,6 +116,7 @@ namespace ScreenManagerUtil
 	void PushLoadedScreen( const LoadedScreen &ls )
 	{
 		LOG->Trace( "PushScreen: \"%s\"", ls.m_pScreen->GetName().c_str() );
+		LOG->MapLog( "ScreenManager::TopScreen", "Top Screen: %s", ls.m_pScreen->GetName().c_str() );
 
 		// Be sure to push the screen first, so GetTopScreen returns the screen
 		// during BeginScreen.
@@ -249,6 +250,7 @@ ScreenManager::ScreenManager()
 ScreenManager::~ScreenManager()
 {
 	LOG->Trace( "ScreenManager::~ScreenManager()" );
+	LOG->UnmapLog( "ScreenManager::TopScreen" );
 
 	SAFE_DELETE( g_pSharedBGA );
 	for( unsigned i=0; i<g_ScreenStack.size(); i++ )
@@ -366,6 +368,11 @@ ScreenMessage ScreenManager::PopTopScreenInternal( bool bSendLoseFocus )
 		}
 	}
 
+	if( g_ScreenStack.size() )
+		LOG->MapLog( "ScreenManager::TopScreen", "Top Screen: %s", g_ScreenStack.back().m_pScreen->GetName().c_str() );
+	else
+		LOG->UnmapLog( "ScreenManager::TopScreen" );
+
 	return ls.m_SendOnPop;
 }
 
@@ -874,11 +881,6 @@ public:
 LUA_REGISTER_CLASS( ScreenManager )
 // lua end
 
-RString StepMania::GetTopScreenName()
-{
-	return SCREENMAN->GetTopScreen()->GetName();
-}
-
 /*
  * (c) 2001-2003 Chris Danford, Glenn Maynard
  * All rights reserved.

stepmania/src/ScreenManager.h

@@ -12,12 +12,6 @@ struct Menu;
 struct lua_State;
 class InputEventPlus;
 
-// For debugging where you don't want to pull in ScreenManager.h.
-namespace StepMania
-{
-	RString GetTopScreenName();
-}
-
 class ScreenManager
 {
 public: