diff --git a/plugins/com.minres.scviewer.database.ftr/META-INF/MANIFEST.MF b/plugins/com.minres.scviewer.database.ftr/META-INF/MANIFEST.MF
index 716ed8c..5a11904 100644
--- a/plugins/com.minres.scviewer.database.ftr/META-INF/MANIFEST.MF
+++ b/plugins/com.minres.scviewer.database.ftr/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: CBOR transaction database
 Bundle-SymbolicName: com.minres.scviewer.database.ftr
-Bundle-Version: 1.0.1.qualifier
+Bundle-Version: 1.0.2.qualifier
 Bundle-Vendor: MINRES Technologies GmbH
 Bundle-RequiredExecutionEnvironment: JavaSE-11
 Import-Package: org.osgi.framework;version="1.3.0",
diff --git a/plugins/com.minres.scviewer.database.ftr/pom.xml b/plugins/com.minres.scviewer.database.ftr/pom.xml
index 1166209..9189a8d 100644
--- a/plugins/com.minres.scviewer.database.ftr/pom.xml
+++ b/plugins/com.minres.scviewer.database.ftr/pom.xml
@@ -2,7 +2,7 @@
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<artifactId>com.minres.scviewer.database.ftr</artifactId>
-	<version>1.0.1-SNAPSHOT</version>
+	<version>1.0.2-SNAPSHOT</version>
 	<parent>
 		<groupId>com.minres.scviewer</groupId>
 		<artifactId>com.minres.scviewer.parent</artifactId>
diff --git a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java
index c65c702..2735152 100644
--- a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java
+++ b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java
@@ -297,10 +297,10 @@ public class FtrDbLoader implements IWaveformDbLoader {
 				case 6: // id/generator/start/end
 					long len = cborDecoder.readArrayLength();
 					assert(len==4);
-					cborDecoder.readInt();
-					cborDecoder.readInt();
-					cborDecoder.readInt();
-					cborDecoder.readInt();
+					cborDecoder.readInt(); //txid
+					cborDecoder.readInt(); // genId
+					cborDecoder.readInt(); // startTime
+					cborDecoder.readInt(); // endTime
 					break;
 				default:  { // skip over 7:begin attr, 8:record attr, 9:end attr
 					long sz = cborDecoder.readArrayLength();
diff --git a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrTx.java b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrTx.java
index f7970ab..c227bd3 100644
--- a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrTx.java
+++ b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrTx.java
@@ -77,8 +77,8 @@ class FtrTx implements Serializable {
 	public List<ITxAttribute> getAttributes(FtrDbLoader loader) {
 		if(attributes.size()==0)
 			try {
-				TxStream stream = loader.txStreams.get(streamId);
-				byte[] chunk = stream.getChunks().get((int)blockId);
+				final TxStream stream = loader.txStreams.get(streamId);
+				final byte[] chunk = stream.getChunks().get((int)blockId);
 				attributes.addAll(loader.parseAtrributes(chunk, blockOffset));
 			} catch (InputFormatException e) {
 				// TODO Auto-generated catch block
diff --git a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxGenerator.java b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxGenerator.java
index f755a92..209eb1f 100644
--- a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxGenerator.java
+++ b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/TxGenerator.java
@@ -70,7 +70,7 @@ class TxGenerator extends AbstractTxStream {
 				List<byte[]> chunks = stream.getChunks();
 				int blockid = 0;
 				for (byte[] bs : chunks) {
-					loader.parseTx(stream, blockid, bs);
+					loader.parseTx(stream, blockid++, bs);
 				}
 			} catch (InputFormatException e) {
 				// TODO Auto-generated catch block
diff --git a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java
index c7f30d2..e395b6a 100644
--- a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java
+++ b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java
@@ -15,10 +15,10 @@ import java.beans.PropertyChangeListener;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -44,13 +44,13 @@ public class WaveformDb extends HierNode implements IWaveformDb, PropertyChangeL
 	private boolean loaded;
 
 	/** The relation types. */
-	private List<RelationType> relationTypes;
+	private List<RelationType> relationTypes = new ArrayList<>();;
 
 	/** The waveforms. */
-	private Map<String, IWaveform> waveforms;
+	private Map<String, IWaveform> waveforms = Collections.synchronizedMap(new HashMap<>()) ;;
 
 	/** The max time. */
-	private long maxTime = -1;
+	private long maxTime = 0L;
 	
 	private static final Logger LOG = LoggerFactory.getLogger(WaveformDb.class);
 	
@@ -81,16 +81,6 @@ public class WaveformDb extends HierNode implements IWaveformDb, PropertyChangeL
 		return Collections.unmodifiableList(loaderFactories);
 	}
 
-	/**
-	 * Instantiates a new waveform db.
-	 */
-	public WaveformDb() {
-		super();
-		waveforms = new ConcurrentHashMap<>();
-		relationTypes = new ArrayList<>();
-		maxTime = 0L;
-	}
-
 	/**
 	 * Gets the max time.
 	 *