diff --git a/core/src/processing/opengl/shaders/LightVert-vc4.glsl b/core/src/processing/opengl/shaders/LightVert-vc4.glsl
index d008c529c..38366fee1 100644
--- a/core/src/processing/opengl/shaders/LightVert-vc4.glsl
+++ b/core/src/processing/opengl/shaders/LightVert-vc4.glsl
@@ -47,7 +47,8 @@ varying vec4 backVertColor;
 
 const float zero_float = 0.0;
 const float one_float = 1.0;
-const vec3 zero_vec3 = vec3(0);
+const vec3 zero_vec3 = vec3(0.0);
+const vec3 minus_one_vec3 = vec3(0.0-1.0);
 
 float falloffFactor(vec3 lightPos, vec3 vertPos, vec3 coeff) {
   vec3 lpv = lightPos - vertPos;
@@ -59,7 +60,7 @@ float falloffFactor(vec3 lightPos, vec3 vertPos, vec3 coeff) {
 
 float spotFactor(vec3 lightPos, vec3 vertPos, vec3 lightNorm, float minCos, float spotExp) {
   vec3 lpv = normalize(lightPos - vertPos);
-  vec3 nln = -one_float * lightNorm;
+  vec3 nln = minus_one_vec3 * lightNorm;
   float spotCos = dot(nln, lpv);
   return spotCos <= minCos ? zero_float : pow(spotCos, spotExp);
 }
@@ -83,7 +84,7 @@ void main() {
   
   // Normal vector in eye coordinates
   vec3 ecNormal = normalize(normalMatrix * normal);
-  vec3 ecNormalInv = ecNormal * -one_float;
+  vec3 ecNormalInv = ecNormal * minus_one_vec3;
   
   // Light calculations
   vec3 totalAmbient = vec3(0, 0, 0);
@@ -110,7 +111,7 @@ void main() {
       
     if (isDir) {
       falloff = one_float;
-      lightDir = -one_float * lightNormal[i];
+      lightDir = minus_one_vec3 * lightNormal[i];
     } else {
       falloff = falloffFactor(lightPos, ecVertex, lightFalloff[i]);  
       lightDir = normalize(lightPos - ecVertex);
diff --git a/core/src/processing/opengl/shaders/TexLightVert-vc4.glsl b/core/src/processing/opengl/shaders/TexLightVert-vc4.glsl
index ef5ed5a61..daa4680fb 100644
--- a/core/src/processing/opengl/shaders/TexLightVert-vc4.glsl
+++ b/core/src/processing/opengl/shaders/TexLightVert-vc4.glsl
@@ -50,7 +50,8 @@ varying vec4 vertTexCoord;
 
 const float zero_float = 0.0;
 const float one_float = 1.0;
-const vec3 zero_vec3 = vec3(0);
+const vec3 zero_vec3 = vec3(0.0);
+const vec3 minus_one_vec3 = vec3(0.0-1.0);
 
 float falloffFactor(vec3 lightPos, vec3 vertPos, vec3 coeff) {
   vec3 lpv = lightPos - vertPos;
@@ -62,7 +63,7 @@ float falloffFactor(vec3 lightPos, vec3 vertPos, vec3 coeff) {
 
 float spotFactor(vec3 lightPos, vec3 vertPos, vec3 lightNorm, float minCos, float spotExp) {
   vec3 lpv = normalize(lightPos - vertPos);
-  vec3 nln = -one_float * lightNorm;
+  vec3 nln = minus_one_vec3 * lightNorm;
   float spotCos = dot(nln, lpv);
   return spotCos <= minCos ? zero_float : pow(spotCos, spotExp);
 }
@@ -86,7 +87,7 @@ void main() {
   
   // Normal vector in eye coordinates
   vec3 ecNormal = normalize(normalMatrix * normal);
-  vec3 ecNormalInv = ecNormal * -one_float;
+  vec3 ecNormalInv = ecNormal * minus_one_vec3;
   
   // Light calculations
   vec3 totalAmbient = vec3(0, 0, 0);
@@ -113,7 +114,7 @@ void main() {
       
     if (isDir) {
       falloff = one_float;
-      lightDir = -one_float * lightNormal[i];
+      lightDir = minus_one_vec3 * lightNormal[i];
     } else {
       falloff = falloffFactor(lightPos, ecVertex, lightFalloff[i]);  
       lightDir = normalize(lightPos - ecVertex);
diff --git a/java/src/processing/mode/java/Commander.java b/java/src/processing/mode/java/Commander.java
index 4739c251f..1807b26bf 100644
--- a/java/src/processing/mode/java/Commander.java
+++ b/java/src/processing/mode/java/Commander.java
@@ -275,6 +275,7 @@ public class Commander implements RunnerListener {
               } else {
                 runner.launch(sketchArgs);
               }
+              success = !runner.vmReturnedError();
             }
           } else {
             success = false;
diff --git a/java/src/processing/mode/java/runner/Runner.java b/java/src/processing/mode/java/runner/Runner.java
index 2410e9c2c..05eba7764 100644
--- a/java/src/processing/mode/java/runner/Runner.java
+++ b/java/src/processing/mode/java/runner/Runner.java
@@ -59,6 +59,7 @@ public class Runner implements MessageConsumer {
 
   // Running remote VM
   protected VirtualMachine vm;
+  protected boolean vmReturnedError;
 
   // Thread transferring remote error stream to our error stream
   protected Thread errThread = null;
@@ -130,6 +131,14 @@ public class Runner implements MessageConsumer {
   }
 
 
+  /**
+   * Whether the last invocation of launchJava() was successful or not
+   */
+  public boolean vmReturnedError() {
+    return vmReturnedError;
+  }
+
+
   /**
    * Simple non-blocking launch of the virtual machine. VM starts suspended.
    * @return debuggee VM or null on failure
@@ -408,6 +417,7 @@ public class Runner implements MessageConsumer {
     new Thread(new Runnable() {
       public void run() {
 //        PApplet.println("java starting");
+        vmReturnedError = false;
         process = PApplet.exec(args);
         try {
 //          PApplet.println("java waiting");
@@ -445,6 +455,7 @@ public class Runner implements MessageConsumer {
             // changing this to separate editor and listener [091124]
             //if (editor != null) {
             listener.statusError("Could not run the sketch.");
+            vmReturnedError = true;
             //}
 //            return null;
           }
@@ -659,6 +670,9 @@ public class Runner implements MessageConsumer {
       }
     } else if (exceptionClass.equals("java.lang.UnsatisfiedLinkError")) {
       listener.statusError("A library used by this sketch is not installed properly.");
+      if (PApplet.platform == PConstants.LINUX) {
+        System.out.println(message);
+      }
       err.println("A library relies on native code that's not available.");
       err.println("Or only works properly when the sketch is run as a " +
         ((Platform.getNativeBits() == 32) ? "64-bit" : "32-bit") + " application.");