diff --git a/CMakeLists.txt b/CMakeLists.txt
index c4b3236..eb88510 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,6 +82,7 @@ set(SRC_NIN10KITGUI
     gui/nin10kitviewer.cpp
     gui/imageutil.cpp
     gui/exporter.cpp
+    gui/wxlogger.cpp
 )
 
 find_package(wxWidgets REQUIRED core base)
diff --git a/gui/exporter.cpp b/gui/exporter.cpp
index 65d3f21..22fcc50 100644
--- a/gui/exporter.cpp
+++ b/gui/exporter.cpp
@@ -91,12 +91,20 @@ void DoExport(int mode, const std::string& filename, std::vector<std::string>& f
         }
     }
 
-    if (params.device == "GBA")
-        DoGBAExport(params.images, params.tileset_images);
-    else if (params.device == "DS")
-        DoDSExport(params.images, params.tileset_images);
-    else if (params.device == "3DS")
-        Do3DSExport(params.images, params.tileset_images);
+    try
+    {
+        if (params.device == "GBA")
+            DoGBAExport(params.images, params.tileset_images);
+        else if (params.device == "DS")
+            DoDSExport(params.images, params.tileset_images);
+        else if (params.device == "3DS")
+            Do3DSExport(params.images, params.tileset_images);
+    }
+    catch (const char* e)
+    {
+        WarnLog("Export failed");
+        return;
+    }
 
     InfoLog("Export complete now writing files");
     // Write the files
diff --git a/gui/nin10kit.cpp b/gui/nin10kit.cpp
index 5db7df9..6d02607 100644
--- a/gui/nin10kit.cpp
+++ b/gui/nin10kit.cpp
@@ -166,7 +166,13 @@ void Nin10KitFrame::OnView(wxCommandEvent& event)
         viewer = new Nin10KitViewerFrame();
 
     viewer->Connect(wxEVT_CLOSE_WINDOW, wxCloseEventHandler(Nin10KitFrame::OnCloseView), NULL, this);
-    viewer->Set(mode->GetSelection(), images);
+    if (!viewer->Set(mode->GetSelection(), images))
+    {
+        viewer->Close(true);
+        delete viewer;
+        viewer = NULL;
+        return;
+    }
     viewer->Show(true);
 }
 
diff --git a/gui/nin10kitapp.cpp b/gui/nin10kitapp.cpp
index 780ae8e..26ee776 100644
--- a/gui/nin10kitapp.cpp
+++ b/gui/nin10kitapp.cpp
@@ -5,12 +5,13 @@
 
 #include "cmd-line-parser-helper.hpp"
 #include "cpercep.hpp"
-#include "logger.hpp"
+#include "wxlogger.hpp"
 
 IMPLEMENT_APP_NO_MAIN(Nin10KitApp);
 
 int main(int argc, char** argv)
 {
+    logger.reset(new LoggerWx());
     Magick::InitializeMagick(*argv);
     cpercep_init();
 
diff --git a/gui/nin10kitviewer.cpp b/gui/nin10kitviewer.cpp
index 1b2c0c1..a1f1ced 100644
--- a/gui/nin10kitviewer.cpp
+++ b/gui/nin10kitviewer.cpp
@@ -16,7 +16,7 @@ Nin10KitViewerFrame::~Nin10KitViewerFrame()
 {
 }
 
-void Nin10KitViewerFrame::Set(int prog_mode, std::map<std::string, ImageInfo>& images)
+bool Nin10KitViewerFrame::Set(int prog_mode, std::map<std::string, ImageInfo>& images)
 {
     std::string mode, device;
     int bpp;
@@ -24,15 +24,24 @@ void Nin10KitViewerFrame::Set(int prog_mode, std::map<std::string, ImageInfo>& i
     GetModeInfo(prog_mode, mode, device, bpp);
     VerboseLog("Viewing in mode %s", mode.c_str());
 
-    if (mode == "3")
-        UpdateMode3(images);
-    else if (mode == "4")
-        UpdateMode4(images);
-    else if (mode == "0")
-        UpdateMode0(images, bpp);
-    else if (mode == "SPRITES")
-        UpdateSprites(images, bpp);
+    try
+    {
+        if (mode == "3")
+            UpdateMode3(images);
+        else if (mode == "4")
+            UpdateMode4(images);
+        else if (mode == "0")
+            UpdateMode0(images, bpp);
+        else if (mode == "SPRITES")
+            UpdateSprites(images, bpp);
+    }
+    catch (const char* e)
+    {
+        WarnLog("Conversion failed");
+        return false;
+    }
     UpdateGraphicsWindow();
+    return true;
 }
 
 void Nin10KitViewerFrame::UpdateMode3(std::map<std::string, ImageInfo>& images)
diff --git a/gui/nin10kitviewer.hpp b/gui/nin10kitviewer.hpp
index 4e29cf1..39c376f 100644
--- a/gui/nin10kitviewer.hpp
+++ b/gui/nin10kitviewer.hpp
@@ -12,7 +12,7 @@ class Nin10KitViewerFrame : public Nin10KitViewerGUI
     public:
         Nin10KitViewerFrame();
         ~Nin10KitViewerFrame();
-        void Set(int mode, std::map<std::string, ImageInfo>& images);
+        bool Set(int mode, std::map<std::string, ImageInfo>& images);
         void OnPrev(wxCommandEvent& event);
 		void OnNext(wxCommandEvent& event);
     private:
diff --git a/shared/image8.cpp b/shared/image8.cpp
index aa69d83..fa7ba53 100644
--- a/shared/image8.cpp
+++ b/shared/image8.cpp
@@ -74,11 +74,16 @@ Magick::Image Image8Bpp::ToMagick() const
 
 Image8BppScene::Image8BppScene(const std::vector<Image16Bpp>& images16, const std::string& name) : Scene(name), palette(new Palette(name))
 {
+    for (const auto& image : images16)
+    {
+        if (image.width & 1)
+            FatalLog("Image: %s width is not a multiple of 2. Please fix", name.c_str());
+    }
     GetPalette(images16, params.palette, params.transparent_color, params.offset, *palette);
 
     images.reserve(images16.size());
-    for (unsigned int i = 0; i < images16.size(); i++)
-        images.emplace_back(new Image8Bpp(images16[i], palette));
+    for (const auto& image : images16)
+        images.emplace_back(new Image8Bpp(image, palette));
 }
 
 const Image8Bpp& Image8BppScene::GetImage(int index) const
diff --git a/shared/logger.hpp b/shared/logger.hpp
index 357d99d..4ef666c 100644
--- a/shared/logger.hpp
+++ b/shared/logger.hpp
@@ -20,14 +20,13 @@ class AbstractLogger
     public:
         AbstractLogger(std::ostream* target = &std::cerr) : out(target), log_level(LogLevel::INFO), log_time(true) {}
         virtual ~AbstractLogger() {}
-        void Log(LogLevel level, const char* format, va_list ap);
+        virtual void Log(LogLevel level, const char* format, va_list ap);
         virtual void DoLog(LogLevel level, const char* format, va_list ap) {}
         void SetLogTarget(std::ostream* stream) {out = stream;}
         void SetLogLevel(LogLevel level) {log_level = level;}
         void SetLogTime(bool logging_time) {log_time = logging_time;}
     protected:
         std::ostream* out;
-    private:
         LogLevel log_level;
         bool log_time;
 };
diff --git a/shared/map.cpp b/shared/map.cpp
index 502c5c6..b628331 100644
--- a/shared/map.cpp
+++ b/shared/map.cpp
@@ -8,6 +8,8 @@
 Map::Map(const Image16Bpp& image, int bpp) : Image(image.width / 8, image.height / 8, image.name, image.filename, image.frame, image.animated),
     data(width * height), tileset(NULL), export_shared_info(true)
 {
+    if ((image.width != 256 && image.width != 512) || (image.height != 256 && image.height != 512))
+        FatalLog("Invalid map size for image %s, (%d %d) Please fix", image.name.c_str(), image.width, image.height);
     // Create tileset according to bpp
     tileset.reset(new Tileset(image, bpp));
 
@@ -26,6 +28,9 @@ Map::Map(const Image16Bpp& image, int bpp) : Image(image.width / 8, image.height
 Map::Map(const Image16Bpp& image, std::shared_ptr<Tileset>& global_tileset) : Image(image.width / 8, image.height / 8, image.name, image.filename, image.frame, image.animated),
     data(width * height), tileset(global_tileset), export_shared_info(false)
 {
+    if ((image.width != 256 && image.width != 512) || (image.height != 256 && image.height != 512))
+        FatalLog("Invalid map size for image %s, (%d %d) Please fix", image.name.c_str(), image.width, image.height);
+
     switch(tileset->bpp)
     {
         case 4:
@@ -144,6 +149,12 @@ void Map::WriteExport(std::ostream& file) const
 
 MapScene::MapScene(const std::vector<Image16Bpp>& images16, const std::string& _name, int bpp) : Scene(_name), tileset(NULL)
 {
+    for (const auto& image : images16)
+    {
+        if ((image.width != 256 && image.width != 512) || (image.height != 256 && image.height != 512))
+            FatalLog("Invalid map size for image %s, (%d %d) Please fix", image.name.c_str(), image.width, image.height);
+    }
+
     tileset.reset(new Tileset(images16, name, bpp));
 
     for (const auto& image : images16)
diff --git a/shared/sprite.cpp b/shared/sprite.cpp
index 8545390..c69bbc6 100644
--- a/shared/sprite.cpp
+++ b/shared/sprite.cpp
@@ -32,7 +32,7 @@ Sprite::Sprite(const Image16Bpp& image, std::shared_ptr<Palette>& global_palette
     shape = sprite_shapes[key];
     size = sprite_sizes[key];
     if (size == -1 || image.width & 7 || image.height & 7)
-        FatalLog("Invalid sprite size, (%d %d) Please fix", image.width, image.height);
+        FatalLog("Invalid sprite size for image %s, (%d %d) Please fix", image.name.c_str(), image.width, image.height);
 
     // Is actually an 8 or 4bpp image
     Image8Bpp image8(image, palette);
@@ -49,7 +49,7 @@ Sprite::Sprite(const Image16Bpp& image, int _bpp) : Image(image.width / 8, image
     shape = sprite_shapes[key];
     size = sprite_sizes[key];
     if (size == -1 || image.width & 7 || image.height & 7)
-        FatalLog("Invalid sprite size, (%d %d) Please fix", image.width, image.height);
+        FatalLog("Invalid sprite size for image %s, (%d %d) Please fix", image.name.c_str(), image.width, image.height);
 
     GetPalette(image.pixels, 1 << bpp, params.transparent_color, 0, *palette);
     // Is actually an 8 or 4bpp image