diff --git a/source/de/anomic/kelondro/kelondroBase64Order.java b/source/de/anomic/kelondro/kelondroBase64Order.java
index 5af455596..2d7d8c35b 100644
--- a/source/de/anomic/kelondro/kelondroBase64Order.java
+++ b/source/de/anomic/kelondro/kelondroBase64Order.java
@@ -48,15 +48,17 @@ package de.anomic.kelondro;
 
 import java.util.Comparator;
 
+import de.anomic.server.logging.serverLog;
+
 public class kelondroBase64Order extends kelondroAbstractOrder implements kelondroOrder, kelondroCoding, Comparator {
 
     private static final char[] alpha_standard = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
     private static final char[] alpha_enhanced = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_".toCharArray();
-    private static final byte[] ahpla_standard = new byte[256];
-    private static final byte[] ahpla_enhanced = new byte[256];
+    private static final byte[] ahpla_standard = new byte[128];
+    private static final byte[] ahpla_enhanced = new byte[128];
     
     static {
-        for (int i = 0; i < 256; i++) {
+        for (int i = 0; i < 128; i++) {
             ahpla_standard[i] = -1;
             ahpla_enhanced[i] = -1;
         }
@@ -279,13 +281,28 @@ public class kelondroBase64Order extends kelondroAbstractOrder implements kelond
     }
     
     public final int compares(byte[] a, int aoffset, int alength, byte[] b, int boffset, int blength) {
+        assert (aoffset + alength <= a.length) : "a.length = " + a.length + ", aoffset = " + aoffset + ", alength = " + alength;
+        assert (boffset + blength <= b.length) : "b.length = " + b.length + ", boffset = " + boffset + ", blength = " + blength;
+        assert (ahpla.length == 128);
         int i = 0;
         final int al = Math.min(alength, a.length - aoffset);
         final int bl = Math.min(blength, b.length - boffset);
         final int len = (al > bl) ? bl : al;
+        byte ac, bc;
+        byte acc, bcc;
         while (i < len) {
-            if (ahpla[a[i + aoffset]] > ahpla[b[i + boffset]]) return 1;
-            if (ahpla[a[i + aoffset]] < ahpla[b[i + boffset]]) return -1;
+            assert (i + aoffset < a.length) : "i = " + i + ", aoffset = " + aoffset + ", a.length = " + a.length + ", a = " + serverLog.arrayList(a, aoffset, len);
+            assert (i + boffset < b.length) : "i = " + i + ", boffset = " + boffset + ", b.length = " + b.length + ", b = " + serverLog.arrayList(b, boffset, len);
+            ac = a[aoffset + i];
+            assert (ac >= 0) && (ac < 128) : "ac = " + ac + ", a = " + serverLog.arrayList(a, aoffset, len);
+            bc = b[boffset + i];
+            assert (bc >= 0) && (bc < 128) : "bc = " + bc + ", b = " + serverLog.arrayList(b, boffset, len);
+            acc = ahpla[ac];
+            assert (acc >= 0) : "acc = " + acc + ", a = " + serverLog.arrayList(a, aoffset, len);
+            bcc = ahpla[bc];
+            assert (bcc >= 0) : "bcc = " + bcc + ", b = " + serverLog.arrayList(b, boffset, len);
+            if (acc > bcc) return 1;
+            if (acc < bcc) return -1;
             // else the bytes are equal and it may go on yet undecided
             i++;
         }
diff --git a/source/de/anomic/kelondro/kelondroFlexTable.java b/source/de/anomic/kelondro/kelondroFlexTable.java
index 04aa47c61..dba762318 100644
--- a/source/de/anomic/kelondro/kelondroFlexTable.java
+++ b/source/de/anomic/kelondro/kelondroFlexTable.java
@@ -91,7 +91,7 @@ public class kelondroFlexTable extends kelondroFlexWidthArray implements kelondr
             node = (kelondroRecords.Node) content.next();
             i = node.handle().hashCode();
             indexentry = ri.row().newEntry();
-            indexentry.setCol(0, node.getValueRow());
+            indexentry.setCol(0, node.getKey());
             indexentry.setCol(1, i);
             ri.addUnique(indexentry);
             if ((i % 10000) == 0) {
diff --git a/source/de/anomic/kelondro/kelondroRecords.java b/source/de/anomic/kelondro/kelondroRecords.java
index 4e4933cbb..88c4f215c 100644
--- a/source/de/anomic/kelondro/kelondroRecords.java
+++ b/source/de/anomic/kelondro/kelondroRecords.java
@@ -1096,10 +1096,12 @@ public class kelondroRecords {
         private byte[] bulk;
         private int bulksize;
         private int bulkstart;  // the offset of the bulk array to the node position
+        private boolean fullyMarked;
         
         public contentNodeIterator(long maxInitTime) throws IOException, kelondroException {
             // initialize markedDeleted set of deleted Handles
             markedDeleted = deletedHandles(maxInitTime);
+            fullyMarked = (maxInitTime < 0);
             
             // seek first position according the delete node set
             pos = new Handle(0);
@@ -1116,6 +1118,21 @@ public class kelondroRecords {
         }
 
         public Object next() {
+            // read Objects until a non-deleted Node appears
+            while (hasNext()) {
+                Node nn = next0();
+                byte[] key = nn.getKey();
+                if ((key == null) || ((key[0] == 0) && (key[1] == 0)) || ((key[2] == 0) && (key[3] == 0))) {
+                    // this is an deleted node; probably not commited with dispose
+                    if (fullyMarked) try {dispose(nn.handle);} catch (IOException e) {} // mark this now as deleted
+                    continue;
+                }
+                return nn;
+            }
+            return null;
+        }
+        
+        public Node next0() {
             try {
                 // see if the next record is in the bulk, and if not re-fill the bulk
                 if ((pos.index - bulkstart) >= bulksize) {
diff --git a/source/de/anomic/kelondro/kelondroRow.java b/source/de/anomic/kelondro/kelondroRow.java
index 030c1df5a..979381957 100644
--- a/source/de/anomic/kelondro/kelondroRow.java
+++ b/source/de/anomic/kelondro/kelondroRow.java
@@ -264,11 +264,13 @@ public class kelondroRow {
         
         private void setCol(int encoding, int offset, int length, byte[] cell) {
             if (cell == null) {
-                while (length-- > 0) rowinstance[offset + length] = 0;
+                while (length-- >= 0) rowinstance[offset + length] = 0;
             } else {
-                System.arraycopy(cell, 0, rowinstance, offset, Math.min(cell.length, length));
                 if (cell.length < length) {
-                    while (length-- > cell.length) rowinstance[offset + length] = 0;
+                    System.arraycopy(cell, 0, rowinstance, offset, cell.length);
+                    while (length-- >= cell.length) rowinstance[offset + length] = 0;
+                } else {
+                    System.arraycopy(cell, 0, rowinstance, offset, length);
                 }
             }
         }
diff --git a/source/de/anomic/kelondro/kelondroRowCollection.java b/source/de/anomic/kelondro/kelondroRowCollection.java
index aa418952e..6a33f6593 100644
--- a/source/de/anomic/kelondro/kelondroRowCollection.java
+++ b/source/de/anomic/kelondro/kelondroRowCollection.java
@@ -453,10 +453,13 @@ public class kelondroRowCollection {
     }
 
     private final int compare(int i, int j) {
-        assert (i < chunkcount);
-        assert (j < chunkcount);
+        assert (chunkcount * this.rowdef.objectsize() <= chunkcache.length) : "chunkcount = " + chunkcount + ", objsize = " + this.rowdef.objectsize() + ", chunkcache.length = " + chunkcache.length;
+        assert (i >= 0) && (i < chunkcount) : "i = " + i + ", chunkcount = " + chunkcount;
+        assert (j >= 0) && (j < chunkcount) : "j = " + j + ", chunkcount = " + chunkcount;
         if (i == j) return 0;
+        assert (this.sortColumn == 0) : "this.sortColumn = " + this.sortColumn;
         int keylength = this.rowdef.width(this.sortColumn);
+        assert (keylength <= 12) : "keylength = " + keylength;
         int colstart  = this.rowdef.colstart[this.sortColumn];
         int c = this.sortOrder.compare(
                 chunkcache,
diff --git a/source/de/anomic/server/logging/serverLog.java b/source/de/anomic/server/logging/serverLog.java
index 81478127d..8bf535260 100644
--- a/source/de/anomic/server/logging/serverLog.java
+++ b/source/de/anomic/server/logging/serverLog.java
@@ -217,4 +217,12 @@ public final class serverLog {
         for (int i = l + n; i > n; n--) sb.insert(0, fillChar);
         return sb.toString();
     }
+    
+    public static final String arrayList(byte[] b, int start, int length) {
+        StringBuffer sb = new StringBuffer(b.length * 4);
+        sb.append('[').append(Integer.toString((int) b[start])).append(',');
+        for (int i = 1; i < length; i++) sb.append(' ').append(Integer.toString((int) b[start + i])).append(',');
+        sb.append(']');
+        return sb.toString();
+    }
 }
diff --git a/source/yacy.java b/source/yacy.java
index 86e06f9c4..f03e18896 100644
--- a/source/yacy.java
+++ b/source/yacy.java
@@ -1325,6 +1325,12 @@ public final class yacy {
      */
     public static void main(String args[]) {
 
+        // check assertion status
+        //ClassLoader.getSystemClassLoader().setDefaultAssertionStatus(true);
+        boolean assertionenabled = false;
+        assert assertionenabled = true;
+        if (assertionenabled) System.out.println("Asserts are enabled");
+        
         // check memory amount
         System.gc();
         long startupMemFree  = Runtime.getRuntime().freeMemory(); // the amount of free memory in the Java Virtual Machine