diff --git a/src/common/console/c_console.cpp b/src/common/console/c_console.cpp
index 3afe02027..41c86abd7 100644
--- a/src/common/console/c_console.cpp
+++ b/src/common/console/c_console.cpp
@@ -65,6 +65,7 @@
 #include "g_input.h"
 #include "c_commandbuffer.h"
 #include "vm.h"
+#include "common/widgets/errorwindow.h"
 
 #define LEFTMARGIN 8
 #define RIGHTMARGIN 8
@@ -411,6 +412,76 @@ void WriteLineToLog(FILE *LogFile, const char *outline)
 bool DisableLogging;
 extern bool gameisdead;
 
+bool IsZWidgetAvailable();
+
+TArray<FString> bufferedConsoleStuff;
+bool restartrequest = false;
+
+void GetLog(std::function<bool(const void* data, uint32_t size, uint32_t& written)> writeData)
+{
+	for (const FString& line : bufferedConsoleStuff)
+	{
+		size_t pos = 0;
+		size_t len = line.Len();
+		while (pos < len)
+		{
+			uint32_t size = (uint32_t)std::min(len - pos, 0x0fffffffULL);
+			uint32_t written = 0;
+			if (!writeData(&line[pos], size, written))
+				return;
+			pos += written;
+		}
+	}
+}
+
+void DeleteStartupScreen();
+void S_StopMusic(bool);
+void I_CloseMainWindow();
+
+void ShowFatalError(const char* text)
+{
+	DeleteStartupScreen();
+	S_StopMusic(true);
+	I_CloseMainWindow();
+
+	if (batchrun || RunningAsTool)
+	{
+		Printf(TEXTCOLOR_ORANGE "%s\n", text);
+		return;
+	}
+
+	if (CVMAbortException::stacktrace.IsNotEmpty())
+	{
+		Printf("%s", CVMAbortException::stacktrace.GetChars());
+	}
+
+	if (!batchrun && !RunningAsTool)
+	{
+		size_t totalsize = 0;
+		for (const FString& line : bufferedConsoleStuff)
+			totalsize += line.Len();
+
+		std::string alltext;
+		alltext.reserve(totalsize);
+		for (const FString& line : bufferedConsoleStuff)
+			alltext.append(line.GetChars(), line.Len());
+
+		if (IsZWidgetAvailable())
+		{
+			restartrequest = ErrorWindow::ExecModal(text, alltext);
+		}
+		else // We are aborting before we even got to load zdoom.pk3
+		{
+			I_ShowFatalError(text);
+			restartrequest = false;
+		}
+	}
+	else
+	{
+		Printf(TEXTCOLOR_ORANGE "%s\n", text);
+	}
+}
+
 int PrintString (int iprintlevel, const char *outline)
 {
 	if ((!RunningAsTool && gameisdead) || DisableLogging)
@@ -430,6 +501,7 @@ int PrintString (int iprintlevel, const char *outline)
 
 		if (printlevel != PRINT_LOG)
 		{
+			bufferedConsoleStuff.Push(outline);
 			I_PrintStr(outline);
 
 			conbuffer->AddText(printlevel, outline);
diff --git a/src/common/console/c_console.h b/src/common/console/c_console.h
index bae857f7d..2c1e9e61f 100644
--- a/src/common/console/c_console.h
+++ b/src/common/console/c_console.h
@@ -66,9 +66,11 @@ void C_Ticker (void);
 
 void AddToConsole (int printlevel, const char *string);
 int PrintString (int printlevel, const char *string);
-int PrintStringHigh (const char *string);
 int VPrintf (int printlevel, const char *format, va_list parms) GCCFORMAT(2);
 
+void GetLog(std::function<bool(const void* data, uint32_t size, uint32_t& written)> writeFile);
+void ShowFatalError(const char* msg);
+
 void C_DrawConsole ();
 void C_ToggleConsole (void);
 void C_FullConsole (void);
diff --git a/src/common/platform/posix/cocoa/i_system.mm b/src/common/platform/posix/cocoa/i_system.mm
index dbddab423..4c421ae6d 100644
--- a/src/common/platform/posix/cocoa/i_system.mm
+++ b/src/common/platform/posix/cocoa/i_system.mm
@@ -122,6 +122,11 @@ void I_ShowFatalError(const char *message)
 	Mac_I_FatalError(message);
 }
 
+void I_CloseMainWindow()
+{
+	I_SetMainWindowVisible(false);
+}
+
 
 int I_PickIWad(WadStuff* const wads, const int numwads, const bool showwin, const int defaultiwad, int&, FString&)
 {
diff --git a/src/common/platform/posix/sdl/hardware.cpp b/src/common/platform/posix/sdl/hardware.cpp
index 46daca4f9..73279ea8a 100644
--- a/src/common/platform/posix/sdl/hardware.cpp
+++ b/src/common/platform/posix/sdl/hardware.cpp
@@ -45,7 +45,6 @@
 
 IVideo *Video;
 
-void I_RestartRenderer();
 
 
 void I_ShutdownGraphics ()
diff --git a/src/common/platform/posix/sdl/i_system.cpp b/src/common/platform/posix/sdl/i_system.cpp
index 48f73571c..7bd9b3dc5 100644
--- a/src/common/platform/posix/sdl/i_system.cpp
+++ b/src/common/platform/posix/sdl/i_system.cpp
@@ -67,10 +67,6 @@
 #include "printf.h"
 #include "launcherwindow.h"
 
-#include "common/widgets/errorwindow.h"
-
-bool IsZWidgetAvailable();
-
 #ifndef NO_GTK
 bool I_GtkAvailable ();
 void I_ShowFatalError_Gtk(const char* errortext);
@@ -141,25 +137,22 @@ void Unix_I_FatalError(const char* errortext)
 		}
 	}
 }
+
+void I_CloseMainWindow()
+{
+	// To do: close the window but do NOT call SDL_QuitSubSystem as ZWidget may also be using it
+}
+
 #endif
 
 
 void I_ShowFatalError(const char *message)
 {
-	if (IsZWidgetAvailable())
-	{
-		// To do: move the console buffer stuff out of the win32 specific stuff so we can use it here...
-		
-		ErrorWindow::ExecModal(message, message);
-	}
-	else
-	{
 #ifdef __APPLE__
-		Mac_I_FatalError(message);
+	Mac_I_FatalError(message);
 #else
-		Unix_I_FatalError(message);
+	Unix_I_FatalError(message);
 #endif
-	}
 }
 
 bool PerfAvailable;
diff --git a/src/common/platform/win32/hardware.cpp b/src/common/platform/win32/hardware.cpp
index d1b41e51c..6fca6681d 100644
--- a/src/common/platform/win32/hardware.cpp
+++ b/src/common/platform/win32/hardware.cpp
@@ -52,7 +52,6 @@
 
 IVideo *Video;
 
-void I_RestartRenderer();
 int currentcanvas = -1;
 bool changerenderer;
 
diff --git a/src/common/platform/win32/i_crash.cpp b/src/common/platform/win32/i_crash.cpp
index 323118537..50d2eee32 100644
--- a/src/common/platform/win32/i_crash.cpp
+++ b/src/common/platform/win32/i_crash.cpp
@@ -27,6 +27,7 @@
 #include <thread>
 #include "i_mainwindow.h"
 #include "version.h"
+#include "c_console.h"
 
 #ifdef _MSC_VER
 #include <dbghelp.h>
@@ -227,7 +228,7 @@ void CrashReporter::create_dump(DumpParams* dump_params, bool launch_uploader)
 			written = tmp;
 			return result == TRUE;
 		};
-	mainwindow.GetLog(writeFile);
+	GetLog(writeFile);
 	CloseHandle(file);
 
 	if (launch_uploader && !uploader_exe.empty())
diff --git a/src/common/platform/win32/i_main.cpp b/src/common/platform/win32/i_main.cpp
index 7e884c5ce..42bf5911b 100644
--- a/src/common/platform/win32/i_main.cpp
+++ b/src/common/platform/win32/i_main.cpp
@@ -196,6 +196,8 @@ void InitExePath()
 
 //==========================================================================
 
+extern bool restartrequest;
+
 int DoMain (HINSTANCE hInstance)
 {
 	LONG WinWidth, WinHeight;
@@ -301,7 +303,7 @@ int DoMain (HINSTANCE hInstance)
 
 	int ret = GameMain ();
 
-	if (mainwindow.CheckForRestart())
+	if (restartrequest)
 	{
 		HMODULE hModule = GetModuleHandleW(nullptr);
 		WCHAR path[MAX_PATH];
@@ -325,10 +327,6 @@ int DoMain (HINSTANCE hInstance)
 				SetConsoleMode(stdinput, 0);
 				ReadConsole(stdinput, &bytes, 1, &bytes, nullptr);
 			}
-			else if (StdOut == nullptr)
-			{
-				mainwindow.ShowErrorPane(nullptr);
-			}
 		}
 	}
 	return ret;
@@ -336,24 +334,15 @@ int DoMain (HINSTANCE hInstance)
 
 void I_ShowFatalError(const char *msg)
 {
-	I_ShutdownGraphics ();
-	if (!RunningAsTool)
-		mainwindow.RestoreConView();
-	S_StopMusic(true);
+	MessageBoxA(0, msg, "Fatal Error", MB_OK | MB_ICONERROR);
+}
 
-	if (CVMAbortException::stacktrace.IsNotEmpty())
-	{
-		Printf("%s", CVMAbortException::stacktrace.GetChars());
-	}
-
-	if (!batchrun && !RunningAsTool)
-	{
-		mainwindow.ShowErrorPane(msg);
-	}
-	else
-	{
-		Printf(TEXTCOLOR_ORANGE "%s\n", msg);
-	}
+void I_CloseMainWindow()
+{
+	I_ShutdownGraphics();
+	I_ShutdownInput();
+	if (mainwindow.GetHandle())
+		ShowWindow(mainwindow.GetHandle(), SW_HIDE);
 }
 
 void I_SetWindowTitle(const char* caption)
diff --git a/src/common/platform/win32/i_mainwindow.cpp b/src/common/platform/win32/i_mainwindow.cpp
index e13374056..4dfb15e0d 100644
--- a/src/common/platform/win32/i_mainwindow.cpp
+++ b/src/common/platform/win32/i_mainwindow.cpp
@@ -20,8 +20,6 @@
 
 #pragma comment(lib, "dwmapi.lib")
 
-bool IsZWidgetAvailable();
-
 MainWindow mainwindow;
 
 void MainWindow::Create(const FString& caption, int x, int y, int width, int height)
@@ -88,81 +86,12 @@ void MainWindow::ShowGameView()
 	}
 }
 
-// Returns the main window to its startup state.
-void MainWindow::RestoreConView()
-{
-	I_ShutdownInput();		// Make sure the mouse pointer is available.
-	ShowWindow(Window, SW_HIDE);
-
-	// Make sure the progress bar isn't visible.
-	DeleteStartupScreen();
-}
-
-// Shows an error message, preferably in the main window, but it can use a normal message box too.
-void MainWindow::ShowErrorPane(const char* text)
-{
-	if (StartWindow)	// Ensure that the network pane is hidden.
-	{
-		I_NetDone();
-	}
-
-	// PrintStr(text);
-
-	size_t totalsize = 0;
-	for (const FString& line : bufferedConsoleStuff)
-		totalsize += line.Len();
-
-	std::string alltext;
-	alltext.reserve(totalsize);
-	for (const FString& line : bufferedConsoleStuff)
-		alltext.append(line.GetChars(), line.Len());
-
-	if (IsZWidgetAvailable())
-	{
-		restartrequest = ErrorWindow::ExecModal(text, alltext);
-	}
-	else // We are aborting before we even got to load zdoom.pk3
-	{
-		MessageBoxA(0, text, "Fatal Error", MB_OK | MB_ICONERROR);
-		restartrequest = false;
-	}
-}
-
-bool MainWindow::CheckForRestart()
-{
-	bool result = restartrequest;
-	restartrequest = false;
-	return result;
-}
-
 // The main window's WndProc during startup. During gameplay, the WndProc in i_input.cpp is used instead.
 LRESULT MainWindow::LConProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
 	return DefWindowProc(hWnd, msg, wParam, lParam);
 }
 
-void MainWindow::PrintStr(const char* cp)
-{
-	bufferedConsoleStuff.Push(cp);
-}
-
-void MainWindow::GetLog(std::function<bool(const void* data, uint32_t size, uint32_t& written)> writeData)
-{
-	for (const FString& line : bufferedConsoleStuff)
-	{
-		size_t pos = 0;
-		size_t len = line.Len();
-		while (pos < len)
-		{
-			uint32_t size = (uint32_t)std::min(len - pos, 0x0fffffffULL);
-			uint32_t written = 0;
-			if (!writeData(&line[pos], size, written))
-				return;
-			pos += written;
-		}
-	}
-}
-
 // each platform has its own specific version of this function.
 void MainWindow::SetWindowTitle(const char* caption)
 {
diff --git a/src/common/platform/win32/i_mainwindow.h b/src/common/platform/win32/i_mainwindow.h
index 2e24619cc..8f9b56e6f 100644
--- a/src/common/platform/win32/i_mainwindow.h
+++ b/src/common/platform/win32/i_mainwindow.h
@@ -17,13 +17,6 @@ public:
 	void Create(const FString& title, int x, int y, int width, int height);
 
 	void ShowGameView();
-	void RestoreConView();
-
-	void ShowErrorPane(const char* text);
-	bool CheckForRestart();
-
-	void PrintStr(const char* cp);
-	void GetLog(std::function<bool(const void* data, uint32_t size, uint32_t& written)> writeFile);
 
 	void SetWindowTitle(const char* caption);
 
@@ -33,8 +26,6 @@ private:
 	static LRESULT CALLBACK LConProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
 
 	HWND Window = 0;
-	bool restartrequest = false;
-	TArray<FString> bufferedConsoleStuff;
 };
 
 extern MainWindow mainwindow;
diff --git a/src/common/platform/win32/i_system.cpp b/src/common/platform/win32/i_system.cpp
index e2e3736e6..68c0e1e07 100644
--- a/src/common/platform/win32/i_system.cpp
+++ b/src/common/platform/win32/i_system.cpp
@@ -335,7 +335,6 @@ static void PrintToStdOut(const char *cpt, HANDLE StdOut)
 
 void I_PrintStr(const char *cp)
 {
-	mainwindow.PrintStr(cp);
 	PrintToStdOut(cp, StdOut);
 }
 
diff --git a/src/common/rendering/i_video.h b/src/common/rendering/i_video.h
index f33d35caf..e12526bcf 100644
--- a/src/common/rendering/i_video.h
+++ b/src/common/rendering/i_video.h
@@ -23,10 +23,6 @@ void I_ShutdownGraphics();
 
 extern IVideo *Video;
 
-void I_PolyPresentInit();
-uint8_t *I_PolyPresentLock(int w, int h, bool vsync, int &pitch);
-void I_PolyPresentUnlock(int x, int y, int w, int h);
-void I_PolyPresentDeinit();
 
 
 #endif // __I_VIDEO_H__
diff --git a/src/d_main.cpp b/src/d_main.cpp
index 95147049b..ebf73e917 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -3936,9 +3936,10 @@ int GameMain()
 	}
 	catch (const std::exception &error)
 	{
-		I_ShowFatalError(error.what());
+		ShowFatalError(error.what());
 		ret = -1;
 	}
+
 	// Unless something really bad happened, the game should only exit through this single point in the code.
 	// No more 'exit', please.
 	D_Cleanup();