diff --git a/src/main/java/net/preibisch/mvrecon/process/interestpointregistration/global/GlobalOpt.java b/src/main/java/net/preibisch/mvrecon/process/interestpointregistration/global/GlobalOpt.java
index ef7d0525..ad70a5c5 100644
--- a/src/main/java/net/preibisch/mvrecon/process/interestpointregistration/global/GlobalOpt.java
+++ b/src/main/java/net/preibisch/mvrecon/process/interestpointregistration/global/GlobalOpt.java
@@ -32,12 +32,14 @@
 
 import mpicbg.models.Affine3D;
 import mpicbg.models.AffineModel3D;
+import mpicbg.models.ErrorStatistic;
 import mpicbg.models.IllDefinedDataPointsException;
 import mpicbg.models.Model;
 import mpicbg.models.NotEnoughDataPointsException;
 import mpicbg.models.RigidModel3D;
 import mpicbg.models.Tile;
 import mpicbg.models.TileConfiguration;
+import mpicbg.models.TileUtil;
 import mpicbg.spim.data.sequence.ViewId;
 import net.imglib2.util.Pair;
 import net.imglib2.util.ValuePair;
@@ -105,7 +107,10 @@ public static < M extends Model< M > > HashMap< ViewId, Tile< M > > computeTiles
 			else
 				IOFunctions.println( "(" + new Date( System.currentTimeMillis() ) + "): prealigned all tiles" );
 
-			tc.optimize( cs.getMaxError(), cs.getMaxIterations(), cs.getMaxPlateauWidth() );
+			System.out.println( "new code ... ");
+
+			tc.optimizeSilently(new ErrorStatistic( cs.getMaxPlateauWidth() + 1 ), cs.getMaxError(), cs.getMaxIterations(), cs.getMaxPlateauWidth() );
+			//tc.optimize( cs.getMaxError(), cs.getMaxIterations(), cs.getMaxPlateauWidth() );
 
 			IOFunctions.println( "(" + new Date( System.currentTimeMillis() ) + "): Global optimization of " + 
 				tc.getTiles().size() +  " view-tiles (Model=" + model.getClass().getSimpleName()  + "):" );
diff --git a/src/main/java/net/preibisch/mvrecon/process/interestpointregistration/global/GlobalOptIterative.java b/src/main/java/net/preibisch/mvrecon/process/interestpointregistration/global/GlobalOptIterative.java
index c1b7ff73..746c8094 100644
--- a/src/main/java/net/preibisch/mvrecon/process/interestpointregistration/global/GlobalOptIterative.java
+++ b/src/main/java/net/preibisch/mvrecon/process/interestpointregistration/global/GlobalOptIterative.java
@@ -107,9 +107,10 @@ public static < M extends Model< M > > HashMap< ViewId, Tile< M > > computeTiles
 				else
 					IOFunctions.println( "(" + new Date( System.currentTimeMillis() ) + "): prealigned all tiles" );
 
-				TileUtil.optimizeConcurrently(
+				tc.optimizeSilently(new ErrorStatistic( ics.getMaxPlateauWidth() + 1 ), ics.getMaxError(), ics.getMaxIterations(), ics.getMaxPlateauWidth() );
+				/*TileUtil.optimizeConcurrently(
 						new ErrorStatistic( ics.getMaxPlateauWidth() + 1 ),  ics.getMaxError(), ics.getMaxIterations(), ics.getMaxPlateauWidth(), 1.0f,
-						tc, tc.getTiles(), tc.getFixedTiles(), Runtime.getRuntime().availableProcessors());
+						tc, tc.getTiles(), tc.getFixedTiles(), Runtime.getRuntime().availableProcessors());*/
 
 				IOFunctions.println( "(" + new Date( System.currentTimeMillis() ) + "): Global optimization of " + tc.getTiles().size());
 				IOFunctions.println( "(" + new Date( System.currentTimeMillis() ) + "):    Avg Error: " + tc.getError() + "px" );