diff --git a/vtm/src/org/oscim/backend/GLAdapter.java b/vtm/src/org/oscim/backend/GLAdapter.java
index 045bf87c..e123fe9d 100644
--- a/vtm/src/org/oscim/backend/GLAdapter.java
+++ b/vtm/src/org/oscim/backend/GLAdapter.java
@@ -24,6 +24,8 @@ public class GLAdapter {
 
 	public static boolean NON_PREMUL_CANVAS;
 
+	public final static boolean debug = true;
+
 	public static GL20 get() {
 		if (g == null)
 			throw new IllegalStateException();
diff --git a/vtm/src/org/oscim/renderer/GLState.java b/vtm/src/org/oscim/renderer/GLState.java
index 103ca9e0..33d87654 100644
--- a/vtm/src/org/oscim/renderer/GLState.java
+++ b/vtm/src/org/oscim/renderer/GLState.java
@@ -41,15 +41,12 @@ public class GLState {
 
 		GL.glDisable(GL20.GL_STENCIL_TEST);
 		GL.glDisable(GL20.GL_DEPTH_TEST);
-
-		//		if (currentTexId != 0) {
-		//			GL.glBindTexture(GL20.GL_TEXTURE_2D, 0);
-		//			currentTexId = 0;
-		//		}
 	}
 
 	public static boolean useProgram(int shaderProgram) {
-		if (shaderProgram != shader) {
+		if (shaderProgram < 0) {
+			shader = -1;
+		} else if (shaderProgram != shader) {
 			GL.glUseProgram(shaderProgram);
 			shader = shaderProgram;
 			return true;
@@ -120,13 +117,10 @@ public class GLState {
 	}
 
 	public static void bindTex2D(int id) {
-		//		if (GLAdapter.GDX_DESKTOP_QUIRKS){
-		//			GL.glBindTexture(GL20.GL_TEXTURE_2D, 0);
-		//if (GLAdapter.GDX_DESKTOP_QUIRKS && id != 0)
-		//	GL.glBindTexture(GL20.GL_TEXTURE_2D, 0);
-		//		} else
-
-		if (currentTexId != id) {
+		if (id < 0) {
+			GL.glBindTexture(GL20.GL_TEXTURE_2D, 0);
+			currentTexId = 0;
+		} else if (currentTexId != id) {
 			GL.glBindTexture(GL20.GL_TEXTURE_2D, id);
 			currentTexId = id;
 		}
diff --git a/vtm/src/org/oscim/renderer/MapRenderer.java b/vtm/src/org/oscim/renderer/MapRenderer.java
index eb113dfa..ef68f3ff 100644
--- a/vtm/src/org/oscim/renderer/MapRenderer.java
+++ b/vtm/src/org/oscim/renderer/MapRenderer.java
@@ -260,7 +260,8 @@ public class MapRenderer {
 		}
 
 		//Log.d(TAG, "begin frame");
-		GLState.bindTex2D(0);
+		GLState.bindTex2D(-1);
+		GLState.useProgram(-1);
 		//GL.glBindTexture(GL20.GL_TEXTURE_2D, 0);
 
 		/* update layers */
@@ -276,6 +277,9 @@ public class MapRenderer {
 
 			renderer.update(pos, changed, mMatrices);
 
+			if (GLAdapter.debug)
+				GLUtils.checkGlError(renderer.getClass().getName());
+
 			if (renderer.isReady)
 				renderer.render(mMapPosition, mMatrices);
 		}
@@ -317,6 +321,9 @@ public class MapRenderer {
 		GL.glDisable(GL20.GL_CULL_FACE);
 		GL.glBlendFunc(GL20.GL_ONE, GL20.GL_ONE_MINUS_SRC_ALPHA);
 
+		GL.glFrontFace(GL20.GL_CW);
+		GL.glCullFace(GL20.GL_BACK);
+
 		if (!mNewSurface) {
 			mMap.updateMap(false);
 			return;