diff --git a/source/g3d_viewer/main.cpp b/source/g3d_viewer/main.cpp
index 356d8868..c89fd0af 100644
--- a/source/g3d_viewer/main.cpp
+++ b/source/g3d_viewer/main.cpp
@@ -448,7 +448,7 @@ MainWindow::MainWindow(	std::pair<string,vector<string> > unitToLoad,
 	std::auto_ptr<wchar_t> wstr(Ansi2WideString(appPath.c_str()));
 	
 	wstring launchApp = wstring(wstr.get()) + L" \"%1\"";
-	DWORD len = launchApp.length() + 1;
+	DWORD len = (DWORD)launchApp.length() + 1;
 	RegSetValueEx(keyHandle, NULL, 0, REG_SZ, (PBYTE)launchApp.c_str(), len);
 	RegCloseKey(keyHandle);
 
@@ -456,7 +456,7 @@ MainWindow::MainWindow(	std::pair<string,vector<string> > unitToLoad,
 	RegCreateKeyEx(HKEY_CURRENT_USER,subKey.c_str(),0, NULL, 0, KEY_ALL_ACCESS, NULL, &keyHandle, &dwDisposition);
 	//Set the value.
 	launchApp = L"megaglest.g3d";
-	len = launchApp.length() + 1;
+	len = (DWORD)launchApp.length() + 1;
 	RegSetValueEx(keyHandle, NULL, 0, REG_SZ, (PBYTE)launchApp.c_str(), len);
 	RegCloseKey(keyHandle);
 
diff --git a/source/glest_game/ai/path_finder.cpp b/source/glest_game/ai/path_finder.cpp
index 07731df3..93314d0d 100644
--- a/source/glest_game/ai/path_finder.cpp
+++ b/source/glest_game/ai/path_finder.cpp
@@ -1663,9 +1663,22 @@ void PathFinder::loadGame(const XmlNode *rootNode) {
 	//				Vec2i pos;
 			curNode->pos = Vec2i::strToVec2(nodePoolNode->getAttribute("pos")->getValue());
 	//				Node *next;
-			curNode->next = &factionState.nodePool[nodePoolNode->getAttribute("next")->getIntValue()];
+			int nextNode = nodePoolNode->getAttribute("next")->getIntValue();
+			if(nextNode >= 0) {
+				curNode->next = &factionState.nodePool[nextNode];
+			}
+			else {
+				curNode->next = NULL;
+			}
+
 	//				Node *prev;
-			curNode->prev = &factionState.nodePool[nodePoolNode->getAttribute("prev")->getIntValue()];
+			int prevNode = nodePoolNode->getAttribute("prev")->getIntValue();
+			if(prevNode >= 0) {
+				curNode->prev = &factionState.nodePool[prevNode];
+			}
+			else {
+				curNode->prev = NULL;
+			}
 	//				float heuristic;
 			curNode->heuristic = nodePoolNode->getAttribute("heuristic")->getFloatValue();
 	//				bool exploredCell;
diff --git a/source/glest_game/graphics/particle_type.cpp b/source/glest_game/graphics/particle_type.cpp
index 841643aa..b8253cce 100644
--- a/source/glest_game/graphics/particle_type.cpp
+++ b/source/glest_game/graphics/particle_type.cpp
@@ -260,7 +260,7 @@ void ParticleSystemType::load(const XmlNode *particleSystemNode, const string &d
 	if(particleSystemNode->hasChild("child-particles")) {
     		const XmlNode *childrenNode= particleSystemNode->getChild("child-particles");
     		if(childrenNode->getAttribute("value")->getBoolValue()) {
-			for(int i = 0; i < childrenNode->getChildCount(); ++i) {
+			for(unsigned int i = 0; i < childrenNode->getChildCount(); ++i) {
 				const XmlNode *particleFileNode= childrenNode->getChild("particle-file",i);
 				string path= particleFileNode->getAttribute("path")->getRestrictedValue();
 				UnitParticleSystemType *unitParticleSystemType= new UnitParticleSystemType();
diff --git a/source/glest_game/graphics/unit_particle_type.cpp b/source/glest_game/graphics/unit_particle_type.cpp
index 7cb480d8..e389039d 100644
--- a/source/glest_game/graphics/unit_particle_type.cpp
+++ b/source/glest_game/graphics/unit_particle_type.cpp
@@ -101,7 +101,7 @@ void UnitParticleSystemType::load(const XmlNode *particleSystemNode, const strin
 		minRadius = 0;
 	}
 	if((minRadius == 0) && (shape == UnitParticleSystem::sConical)) {
-		minRadius = 0.001; // fudge it so we aren't generating particles that are exactly centred
+		minRadius = 0.001f; // fudge it so we aren't generating particles that are exactly centred
 		if(minRadius > radius)
 			radius = minRadius;
 	}
@@ -175,7 +175,7 @@ void UnitParticleSystemType::load(const XmlNode *particleSystemNode, const strin
 		const float delay_secs = delayNode->getAttribute("value")->getFloatValue();
 		if(delay_secs < 0)
 			throw runtime_error("particle effect delay cannot be negative");
-		delay = delay_secs * GameConstants::updateFps;
+		delay = (int)delay_secs * GameConstants::updateFps;
 	} else{
 		delay= 0;
 	}
@@ -186,7 +186,7 @@ void UnitParticleSystemType::load(const XmlNode *particleSystemNode, const strin
 		const float lifetime_secs = lifetimeNode->getAttribute("value")->getFloatValue();
 		if(lifetime_secs < 0 && lifetime_secs != -1)
 			throw runtime_error("particle effect lifetime cannot be negative (-1 means inherited from parent particle)");
-		lifetime = lifetime_secs * GameConstants::updateFps;
+		lifetime = (int)lifetime_secs * GameConstants::updateFps;
 	} else{
 		lifetime= -1; //default
 	}
diff --git a/source/glest_map_editor/main.cpp b/source/glest_map_editor/main.cpp
index 26c7107e..55bc4a19 100644
--- a/source/glest_map_editor/main.cpp
+++ b/source/glest_map_editor/main.cpp
@@ -1455,7 +1455,7 @@ bool SimpleDialog::show(const string &title, bool wide) {
 
 	vector<wxTextCtrl*> texts;
 	for (Values::iterator it = values.begin(); it != values.end(); ++it) {
-	    int helptextpos = it->second.find_first_of('|');
+	    size_t helptextpos = it->second.find_first_of('|');
 		sizer->Add(new wxStaticText(this, -1, ToUnicode(it->first)), 0, wxALL, 5);
 		wxTextCtrl *text = new wxTextCtrl(this, -1, ToUnicode(it->second.substr(0,helptextpos)));
 		if(wide) text->SetMinSize( wxSize((text->GetSize().GetWidth())*4, text->GetSize().GetHeight()));  // 4 time as wide as default
diff --git a/source/shared_lib/include/graphics/gl/opengl.h b/source/shared_lib/include/graphics/gl/opengl.h
index 87f453cc..0ca8dfbf 100644
--- a/source/shared_lib/include/graphics/gl/opengl.h
+++ b/source/shared_lib/include/graphics/gl/opengl.h
@@ -52,6 +52,12 @@ void checkGlExtension(const char *extensionName);
 void inline _assertGl(const char *file, int line, GLenum *forceErrorNumber = NULL) {
 	GLenum error = (forceErrorNumber != NULL ? *forceErrorNumber : glGetError());
 	if(error != GL_NO_ERROR) {
+#ifdef _DEBUG
+		if(error == GL_INVALID_ENUM) {
+			return;
+		}
+#endif
+
 		//if(error != GL_INVALID_ENUM) {
 			const char *errorString= reinterpret_cast<const char*>(gluErrorString(error));
 			char szBuf[4096]="";
diff --git a/source/tools/glexemel/g2xml.c b/source/tools/glexemel/g2xml.c
index 1505a22c..66dc8d90 100644
--- a/source/tools/glexemel/g2xml.c
+++ b/source/tools/glexemel/g2xml.c
@@ -133,7 +133,7 @@ int g3d2xml(FILE *infile, FILE *outfile)
 	uint8 textureName[NAMESIZE];
 	float32 *fdata;
 	uint32 *idata;
-	int ii, jj, kk;
+	unsigned int ii, jj, kk;
 
 	/* read in the FileHeader */
 	nBytes = sizeof(struct FileHeader);