diff --git a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/AbstractTxStream.java b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/AbstractTxStream.java
index 2ae238a..310407b 100644
--- a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/AbstractTxStream.java
+++ b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/AbstractTxStream.java
@@ -153,8 +153,11 @@ abstract class AbstractTxStream extends HierNode implements IWaveform {
 				switch(evt.getKind()) {
 				case END: //TODO: might throw NPE in concurrent execution
 					Long txId = txEvt.getTransaction().getId();
-					txEvt.setConcurrencyIndex(rowByTxId.get(txId));
-					rowByTxId.remove(txId);
+					Integer row = rowByTxId.get(txId);
+					if(row!=null) {
+						txEvt.setConcurrencyIndex(row);
+						rowByTxId.remove(txId);
+					}
 					break;
 				case SINGLE:
 					for (; rowIdx < rowEndTime.size() && rowEndTime.get(rowIdx)>tx.getBeginTime(); rowIdx++);
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 a257df0..85ab7c7 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
@@ -238,6 +238,8 @@ public class FtrDbLoader implements IWaveformDbLoader {
 					genId = cborDecoder.readInt();
 					long startTime = cborDecoder.readInt()*time_scale_factor;
 					long endTime = cborDecoder.readInt()*time_scale_factor;
+					if(endTime<startTime) // fix buggy recording, end time needs to be later or equal start time
+						endTime=startTime;
 					TxGenerator gen = txGenerators.get(genId);
 					TxStream stream = gen.stream;
 					FtrTx scvTx = new FtrTx(txId, stream.getId(), genId, startTime, endTime, blockId, blockOffset);
diff --git a/plugins/com.minres.scviewer.database.ui.swt/src/com/minres/scviewer/database/ui/swt/internal/StreamPainter.java b/plugins/com.minres.scviewer.database.ui.swt/src/com/minres/scviewer/database/ui/swt/internal/StreamPainter.java
index 64743bf..851d610 100644
--- a/plugins/com.minres.scviewer.database.ui.swt/src/com/minres/scviewer/database/ui/swt/internal/StreamPainter.java
+++ b/plugins/com.minres.scviewer.database.ui.swt/src/com/minres/scviewer/database/ui/swt/internal/StreamPainter.java
@@ -124,7 +124,8 @@ public class StreamPainter extends TrackPainter{
 
 	protected void drawTx(Projection proj, Rectangle area, ITx tx, int concurrencyIndex, boolean highlighted ) {
 		// compute colors
-		Color[] transColor = waveCanvas.styleProvider.computeColor( tx.getGenerator().getName());
+		IWaveform generator = tx.getGenerator();
+		Color[] transColor = waveCanvas.styleProvider.computeColor( generator!=null?generator.getName():"unknown");
 
 		proj.setBackground(transColor[highlighted?1:0]);
 
diff --git a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/WaveformViewer.java b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/WaveformViewer.java
index 7c6ee2c..42ce78e 100644
--- a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/WaveformViewer.java
+++ b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/WaveformViewer.java
@@ -653,7 +653,9 @@ public class WaveformViewer implements IFileChangeListener, IPreferenceChangeLis
 	public void reloadDatabase() {
 		Map<String, String> state = new HashMap<>();
 		saveWaveformViewerState(state);
+		setSelection(null);
 		waveformPane.getStreamList().clear();
+		waveformPane.update();
 		if(database.isLoaded())
 			database.close();
 		database =  dbFactory.getDatabase();
diff --git a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/txTableTree/AbstractTransactionTreeContentProvider.java b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/txTableTree/AbstractTransactionTreeContentProvider.java
index 6b7d13e..df34739 100644
--- a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/txTableTree/AbstractTransactionTreeContentProvider.java
+++ b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/txTableTree/AbstractTransactionTreeContentProvider.java
@@ -5,6 +5,7 @@ import java.util.Vector;
 import org.eclipse.jface.viewers.ITreeContentProvider;
 import org.eclipse.jface.viewers.Viewer;
 
+import com.minres.scviewer.database.IWaveform;
 import com.minres.scviewer.database.tx.ITx;
 import com.minres.scviewer.database.tx.ITxRelation;
 import com.minres.scviewer.e4.application.Messages;
@@ -51,9 +52,11 @@ public abstract class AbstractTransactionTreeContentProvider implements ITreeCon
 			TransactionTreeNode node=(TransactionTreeNode) element;
 			switch(node.type) {
 			case PROPS:
+				IWaveform stream = node.element.getStream();
+				IWaveform generator = node.element.getGenerator();
 				return new Object[][]{
-					{Messages.TransactionDetails_1, Messages.TransactionDetails_16, node.element.getStream().getFullName()},
-					{Messages.TransactionDetails_2, Messages.TransactionDetails_16, node.element.getGenerator().getName()},
+					{Messages.TransactionDetails_1, Messages.TransactionDetails_16, stream!=null?stream.getFullName():"[unknown]"},
+					{Messages.TransactionDetails_2, Messages.TransactionDetails_16, generator!=null?generator.getName():"[unknown]"},
 					{Messages.TransactionDetails_19, Messages.TransactionDetails_20, waveformViewerPart.getScaledTime(node.element.getBeginTime())},
 					{Messages.TransactionDetails_21, Messages.TransactionDetails_20, waveformViewerPart.getScaledTime(node.element.getEndTime())}
 				};
diff --git a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/txTableTree/TransactionTreeNode.java b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/txTableTree/TransactionTreeNode.java
index 539d2d9..8613c77 100644
--- a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/txTableTree/TransactionTreeNode.java
+++ b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/txTableTree/TransactionTreeNode.java
@@ -16,12 +16,12 @@ import com.minres.scviewer.e4.application.Messages;
 public class TransactionTreeNode implements Comparable<TransactionTreeNode>{
 
 	/** The type. */
-	public TransactionTreeNodeType type;
+	public final TransactionTreeNodeType type;
 
 	/** The element. */
-	public ITx element;
+	public final ITx element;
 
-	private String hier_path;
+	private final String hier_path;
 	/**
 	 * Instantiates a new tree node.
 	 *