diff --git a/src/gba/GBA.cpp b/src/gba/GBA.cpp
index 72b5e33c..a76c4468 100644
--- a/src/gba/GBA.cpp
+++ b/src/gba/GBA.cpp
@@ -1764,11 +1764,18 @@ int CPULoadRomData(const char *data, int size)
 
 void doMirroring (bool b)
 {
-  u32 mirroredRomSize = (((romSize)>>20) & 0x3F)<<20;
-  u32 mirroredRomAddress = romSize;
+  int romSizeRounded = romSize;
+  romSizeRounded--;
+  romSizeRounded |= romSizeRounded >> 1;
+  romSizeRounded |= romSizeRounded >> 2;
+  romSizeRounded |= romSizeRounded >> 4;
+  romSizeRounded |= romSizeRounded >> 8;
+  romSizeRounded |= romSizeRounded >> 16;
+  romSizeRounded++;
+  u32 mirroredRomSize = (((romSizeRounded) >> 20) & 0x3F) << 20;
+  u32 mirroredRomAddress = mirroredRomSize;
   if ((mirroredRomSize <=0x800000) && (b))
   {
-    mirroredRomAddress = mirroredRomSize;
     if (mirroredRomSize==0)
         mirroredRomSize=0x100000;
     while (mirroredRomAddress<0x01000000)
diff --git a/src/sdl/SDL.cpp b/src/sdl/SDL.cpp
index 703f8ca8..dd03d1ce 100644
--- a/src/sdl/SDL.cpp
+++ b/src/sdl/SDL.cpp
@@ -180,7 +180,7 @@ enum VIDEO_SIZE{
 u32 throttleLastTime = 0;
 
 bool pauseNextFrame = false;
-int sdlMirroringEnable = 0;
+int sdlMirroringEnable = 1;
 
 static int ignore_first_resize_event = 0;
 
diff --git a/src/wx/panel.cpp b/src/wx/panel.cpp
index e12acc7d..1a2e4b0d 100644
--- a/src/wx/panel.cpp
+++ b/src/wx/panel.cpp
@@ -207,20 +207,21 @@ void GameArea::LoadGame(const wxString &name)
 	    flashSetSize(fsz);
 	    cpuSaveType = cfg->Read(wxT("saveType"), cpuSaveType);
 	    if(cpuSaveType < 0 || cpuSaveType > 5)
-		cpuSaveType = cpuSaveType;
+			cpuSaveType = 0;
 		
 		if (cpuSaveType == 0)
 		  utilGBAFindSave(rom_size);
 		else
 		  saveType = cpuSaveType;
 		
-	    mirroringEnable = cfg->Read(wxT("mirroringEnabled"), (long)0);
+	    mirroringEnable = cfg->Read(wxT("mirroringEnabled"), (long)1);
 
 	    cfg->SetPath(wxT("/"));
 	} else {
 	    rtcEnable(rtcEnabled);
 	    flashSetSize(0x10000 << winFlashSize);
-	    cpuSaveType = cpuSaveType;
+		if (cpuSaveType < 0 || cpuSaveType > 5)
+			cpuSaveType = 0;
 		if (cpuSaveType == 0)
 		  utilGBAFindSave(rom_size);
 		else