diff --git a/plugins/com.minres.scviewer.database.ui.swt/src/com/minres/scviewer/database/ui/swt/internal/ArrowPainter.java b/plugins/com.minres.scviewer.database.ui.swt/src/com/minres/scviewer/database/ui/swt/internal/ArrowPainter.java
index e7f4f27..990c9a2 100644
--- a/plugins/com.minres.scviewer.database.ui.swt/src/com/minres/scviewer/database/ui/swt/internal/ArrowPainter.java
+++ b/plugins/com.minres.scviewer.database.ui.swt/src/com/minres/scviewer/database/ui/swt/internal/ArrowPainter.java
@@ -84,7 +84,10 @@ public class ArrowPainter implements IPainter {
 	private int getConcurrencyIndex(ITx tx) {
 		IEvent[] eventList = tx.getStream().getEventsBeforeTime(tx.getBeginTime());
 		Optional<Integer> res = Arrays.stream(eventList).map(e -> ((ITxEvent)e).getRowIndex()).findFirst();
-		return res.isPresent()? res.get():0;
+		if(res.isPresent() && res.get()>0) {
+			return res.get();
+		} else 			
+			return 0;
 	}
 	
 	protected boolean calculateGeometries() {
@@ -98,8 +101,10 @@ public class ArrowPainter implements IPainter {
 			return true;
 		}
 		int laneHeight = painter.getHeight() / tx.getStream().getRowCount();
+		int laneOffset = laneHeight * getConcurrencyIndex(tx);
+		int rulerHeight = waveCanvas.rulerHeight;
 		txRectangle = new Rectangle((int) (tx.getBeginTime() / scaleFactor),
-				waveCanvas.rulerHeight + painter.getVerticalOffset() + laneHeight * getConcurrencyIndex(tx),
+				rulerHeight + painter.getVerticalOffset() + laneOffset,
 				(int) ((tx.getEndTime() - tx.getBeginTime()) / scaleFactor), laneHeight);
 		deriveGeom(tx.getIncomingRelations(), iRect, false);
 		deriveGeom(tx.getOutgoingRelations(), oRect, true);
@@ -114,12 +119,13 @@ public class ArrowPainter implements IPainter {
 					if (waveCanvas.wave2painterMap.containsKey(iWaveform)) {
 						IWaveformPainter painter = waveCanvas.wave2painterMap.get(iWaveform);
 						if(painter!=null) {
-							int height = waveCanvas.styleProvider.getTrackHeight();
+							int laneHeight = waveCanvas.styleProvider.getTrackHeight();
+							int laneOffset = laneHeight * getConcurrencyIndex(tx);
 							Rectangle bb = new Rectangle(
 									(int) (otherTx.getBeginTime() / scaleFactor),
-									waveCanvas.rulerHeight + painter.getVerticalOffset() + height * getConcurrencyIndex(otherTx),
+									waveCanvas.rulerHeight + painter.getVerticalOffset() + laneOffset,
 									(int) ((otherTx.getEndTime() - otherTx.getBeginTime()) / scaleFactor),
-									height);
+									laneHeight);
 							res.add(new LinkEntry(bb, iTxRelation.getRelationType()));				
 						}
 					}
diff --git a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/TransactionList.java b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/TransactionList.java
index 1bfa169..3461777 100644
--- a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/TransactionList.java
+++ b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/parts/TransactionList.java
@@ -267,6 +267,7 @@ public class TransactionList extends Composite {
 						.map(e -> new AttributeNameBean(e.getKey(), e.getValue()))
 						.collect(Collectors.toList());
 				getDisplay().asyncExec(() -> {
+					if(tableViewer.getControl().isDisposed()) return;
 					tableViewer.setInput(txList);
 					attrNames.clear();
 					attrNames.addAll(newAttrNames);
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 a0e5489..7c6ee2c 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
@@ -828,7 +828,18 @@ public class WaveformViewer implements IFileChangeListener, IPreferenceChangeLis
 				if(Boolean.parseBoolean(state.get(SHOWN_WAVEFORM + i + WAVEFORM_SELECTED)))
 					selectedTrackEntries.add(trackEntry);
 			} else {
-				IWaveform waveform = database.getStreamByName(state.get(SHOWN_WAVEFORM + i));
+				String name = state.get(SHOWN_WAVEFORM + i);
+				IWaveform waveform = database.getStreamByName(name);
+				if (waveform == null) {
+					int pos = name.lastIndexOf('.');
+					waveform = database.getStreamByName(name.substring(0, pos));
+					if(waveform!=null) {
+						List<IHierNode> childs = waveform.getChildNodes();
+						waveform = (IWaveform) childs.stream().filter(node -> name.substring(pos+1).equals(node.getName()))
+						  .findAny()
+						  .orElse(null);
+					}
+				}
 				if (waveform != null) {
 					TrackEntry trackEntry = waveformPane.addWaveform(waveform, -1);
 					//check if t is selected