diff --git a/README.md b/README.md
index 0f6456c1..b9af12ba 100644
--- a/README.md
+++ b/README.md
@@ -77,6 +77,6 @@ Build plugin.
 
 ## License
 
-Rack source code by [Andrew Belt](https://andrewbelt.name/) licensed under the [BSD-3-Clause](LICENSE.txt)
+Rack source code by [Andrew Belt](https://andrewbelt.name/) licensed under [BSD-3-Clause](LICENSE.txt)
 
-Component Library graphics by [Grayscale](http://grayscale.info/) licensed under the [CC BY-NC 4.0](https://creativecommons.org/licenses/by-nc/4.0/)
+Component Library graphics by [Grayscale](http://grayscale.info/) licensed under [CC BY-NC 4.0](https://creativecommons.org/licenses/by-nc/4.0/)
diff --git a/arch.mk b/arch.mk
index 25d7f4c3..cf26b179 100644
--- a/arch.mk
+++ b/arch.mk
@@ -1,5 +1,7 @@
 # Detect architecture if ARCH is not defined
 
+ifndef ARCH
+
 MACHINE = $(shell gcc -dumpmachine)
 ifneq (,$(findstring linux,$(MACHINE)))
 	# Linux
@@ -11,5 +13,7 @@ else ifneq (,$(findstring mingw,$(MACHINE)))
 	# Windows
 	ARCH = win
 else
-	$(error Could not determine machine type. Try hacking around in Makefile-arch.inc)
+	$(error Could not determine machine type. Try hacking around in arch.mk)
 endif
+
+endif
\ No newline at end of file
diff --git a/compile.mk b/compile.mk
index edfcee9a..acaf8a0e 100644
--- a/compile.mk
+++ b/compile.mk
@@ -5,7 +5,8 @@ FLAGS += -DVERSION=$(VERSION) -DVERSION_$(subst .,_,$(VERSION))
 FLAGS += -MMD
 # Optimization
 FLAGS += -O3 -march=nocona -ffast-math
-FLAGS += -g -Wall
+FLAGS += -Wall
+FLAGS += -g
 CXXFLAGS += -std=c++11
 
 
diff --git a/include/util.hpp b/include/util.hpp
index 65abf21f..755b4351 100644
--- a/include/util.hpp
+++ b/include/util.hpp
@@ -28,6 +28,8 @@ will expand to
 */
 #define TOSTRING(x) STRINGIFY(x)
 
+#define LENGTHOF(arr) (sizeof(arr) / sizeof((arr)[0]))
+
 
 namespace rack {
 
diff --git a/src/app/RackWidget.cpp b/src/app/RackWidget.cpp
index 47c754a3..0dbf8af9 100644
--- a/src/app/RackWidget.cpp
+++ b/src/app/RackWidget.cpp
@@ -268,6 +268,9 @@ void RackWidget::cloneModule(ModuleWidget *m) {
 }
 
 bool RackWidget::requestModuleBox(ModuleWidget *m, Rect box) {
+	if (box.pos.x < 0 || box.pos.y < 0)
+		return false;
+
 	for (Widget *child2 : moduleContainer->children) {
 		if (m == child2) continue;
 		if (box.intersects(child2->box)) {
diff --git a/src/app/Toolbar.cpp b/src/app/Toolbar.cpp
index 4a421522..1c8b5cfe 100644
--- a/src/app/Toolbar.cpp
+++ b/src/app/Toolbar.cpp
@@ -160,7 +160,6 @@ Toolbar::Toolbar() {
 		plugLightButton->box.pos = Vec(xPos, margin);
 		plugLightButton->box.size.x = 100;
 		plugLightButton->label = "Plug lights";
-		plugLightButton->setValue(1.0);
 		addChild(plugLightButton);
 		xPos += plugLightButton->box.size.x;
 	}
diff --git a/src/app/WireWidget.cpp b/src/app/WireWidget.cpp
index bfcddc8a..9267e79f 100644
--- a/src/app/WireWidget.cpp
+++ b/src/app/WireWidget.cpp
@@ -69,7 +69,7 @@ static void drawWire(NVGcontext *vg, Vec pos1, Vec pos2, NVGcolor color, float t
 }
 
 
-static const NVGcolor wireColors[6] = {
+static const NVGcolor wireColors[] = {
 	nvgRGB(0xc9, 0xb7, 0x0e), // yellow
 	nvgRGB(0xc9, 0x18, 0x47), // red
 	nvgRGB(0x0c, 0x8e, 0x15), // green
@@ -77,13 +77,13 @@ static const NVGcolor wireColors[6] = {
 	nvgRGB(0x44, 0x44, 0x44), // black
 	// nvgRGB(0x66, 0x66, 0x66), // gray
 	// nvgRGB(0x88, 0x88, 0x88), // light gray
-	nvgRGB(0xaa, 0xaa, 0xaa), // white
+	// nvgRGB(0xaa, 0xaa, 0xaa), // white
 };
 static int lastWireColorId = -1;
 
 
 WireWidget::WireWidget() {
-	lastWireColorId = (lastWireColorId + 1) % 6;
+	lastWireColorId = (lastWireColorId + 1) % LENGTHOF(wireColors);
 	color = wireColors[lastWireColorId];
 
 	inputLight = construct<PolarityLight>(&PolarityLight::posColor, COLOR_GREEN, &PolarityLight::negColor, COLOR_RED);
diff --git a/src/gui.cpp b/src/gui.cpp
index 8487002c..dcf71f18 100644
--- a/src/gui.cpp
+++ b/src/gui.cpp
@@ -244,7 +244,10 @@ void guiInit() {
 	// Set up GLFW
 	glfwSetErrorCallback(errorCallback);
 	err = glfwInit();
-	assert(err);
+	if (err) {
+		osdialog_message(OSDIALOG_ERROR, OSDIALOG_OK, "Could not initialize GLFW.");
+		exit(1);
+	}
 
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
@@ -256,7 +259,7 @@ void guiInit() {
 	glfwWindowHint(GLFW_DOUBLEBUFFER, GLFW_TRUE);
 	gWindow = glfwCreateWindow(640, 480, "", NULL, NULL);
 	if (!gWindow) {
-		osdialog_message(OSDIALOG_ERROR, OSDIALOG_OK, "Cannot open window with OpenGL 2.0 renderer. Does your graphics card support OpenGL 2.0? If so, are the latest drivers installed?");
+		osdialog_message(OSDIALOG_ERROR, OSDIALOG_OK, "Cannot open window with OpenGL 2.0 renderer. Does your graphics card support OpenGL 2.0 or greater? If so, are the latest drivers installed?");
 		exit(1);
 	}
 
@@ -275,7 +278,10 @@ void guiInit() {
 	// Set up GLEW
 	glewExperimental = GL_TRUE;
 	err = glewInit();
-	assert(err == GLEW_OK);
+	if (err != GLEW_OK) {
+		osdialog_message(OSDIALOG_ERROR, OSDIALOG_OK, "Could not initialize GLEW. Does your graphics card support OpenGL 2.0 or greater? If so, are the latest drivers installed?");
+		exit(1);
+	}
 
 	// GLEW generates GL error because it calls glGetString(GL_EXTENSIONS), we'll consume it here.
 	glGetError();