diff --git a/src/main/java/de/neemann/digital/draw/shapes/MissingShape.java b/src/main/java/de/neemann/digital/draw/shapes/MissingShape.java
index b57bbfbdf..093dee09a 100644
--- a/src/main/java/de/neemann/digital/draw/shapes/MissingShape.java
+++ b/src/main/java/de/neemann/digital/draw/shapes/MissingShape.java
@@ -28,14 +28,7 @@ public class MissingShape implements Shape {
      */
     public MissingShape(String elementName, Exception cause) {
         this.message = Lang.get("msg_missingShape_N", elementName);
-        this.cause = getMessage(cause);
-    }
-
-    private String getMessage(Throwable e) {
-        String message = e.getMessage();
-        if (e.getCause() != null)
-            message += "; " + getMessage(e.getCause());
-        return message;
+        this.cause = cause.getMessage();
     }
 
     @Override
diff --git a/src/main/java/de/neemann/digital/gui/components/EditorFactory.java b/src/main/java/de/neemann/digital/gui/components/EditorFactory.java
index 00bab2b26..6bedfc126 100644
--- a/src/main/java/de/neemann/digital/gui/components/EditorFactory.java
+++ b/src/main/java/de/neemann/digital/gui/components/EditorFactory.java
@@ -13,10 +13,7 @@ import de.neemann.digital.gui.components.testing.TestDataEditor;
 import de.neemann.digital.gui.sync.NoSync;
 import de.neemann.digital.lang.Lang;
 import de.neemann.digital.testing.TestData;
-import de.neemann.gui.ErrorMessage;
-import de.neemann.gui.LineBreaker;
-import de.neemann.gui.MyFileChooser;
-import de.neemann.gui.ToolTipAction;
+import de.neemann.gui.*;
 import de.neemann.gui.language.Bundle;
 import de.neemann.gui.language.Language;
 
@@ -242,7 +239,15 @@ public final class EditorFactory {
                         button.setBackground(color);
                     }
                 }
-            });
+            }) {
+                @Override
+                protected void paintComponent(Graphics graphics) {
+                    graphics.setColor(Color.WHITE);
+                    graphics.fillRect(0, 0, getWidth(), getHeight());
+                    super.paintComponent(graphics);
+                }
+            };
+            button.setPreferredSize(new Dimension(10, Screen.getInstance().getFontSize() * 3 / 2));
             button.setBackground(color);
         }
 
diff --git a/src/main/java/de/neemann/digital/testing/TestData.java b/src/main/java/de/neemann/digital/testing/TestData.java
index 7f0801dc2..5143fa5d7 100644
--- a/src/main/java/de/neemann/digital/testing/TestData.java
+++ b/src/main/java/de/neemann/digital/testing/TestData.java
@@ -1,5 +1,6 @@
 package de.neemann.digital.testing;
 
+import de.neemann.digital.lang.Lang;
 import de.neemann.digital.testing.parser.LineEmitter;
 import de.neemann.digital.testing.parser.Parser;
 import de.neemann.digital.testing.parser.ParserException;
@@ -66,7 +67,7 @@ public class TestData {
                 lines = tdp.getLines();
                 names = tdp.getNames();
             } catch (ParserException | IOException e) {
-                throw new TestingDataException(e);
+                throw new TestingDataException(Lang.get("err_errorParsingTestdata"), e);
             }
         }
     }
diff --git a/src/main/java/de/neemann/digital/testing/TestResult.java b/src/main/java/de/neemann/digital/testing/TestResult.java
index 6cb370a5a..8ed3e1e9a 100644
--- a/src/main/java/de/neemann/digital/testing/TestResult.java
+++ b/src/main/java/de/neemann/digital/testing/TestResult.java
@@ -96,7 +96,7 @@ public class TestResult {
         try {
             lines.emitLines(new LineListenerResolveDontCare(values -> checkRow(model, values), inputs), new Context());
         } catch (ParserException e) {
-            throw new TestingDataException(e);
+            throw new TestingDataException(Lang.get("err_errorParsingTestdata"), e);
         } catch (RuntimeException e) {
             if (allPassed) {
                 allPassed = false;
diff --git a/src/main/java/de/neemann/digital/testing/TestingDataException.java b/src/main/java/de/neemann/digital/testing/TestingDataException.java
index db24f5f1e..ad1558960 100644
--- a/src/main/java/de/neemann/digital/testing/TestingDataException.java
+++ b/src/main/java/de/neemann/digital/testing/TestingDataException.java
@@ -7,10 +7,11 @@ public class TestingDataException extends Exception {
     /**
      * creates a new instance
      *
-     * @param cause the cause
+     * @param message the error message
+     * @param cause   the cause
      */
-    public TestingDataException(Exception cause) {
-        super(cause);
+    public TestingDataException(String message, Exception cause) {
+        super(message, cause);
     }
 
     /**
diff --git a/src/main/java/de/neemann/gui/ErrorMessage.java b/src/main/java/de/neemann/gui/ErrorMessage.java
index f1cdb7d9f..b396c2816 100644
--- a/src/main/java/de/neemann/gui/ErrorMessage.java
+++ b/src/main/java/de/neemann/gui/ErrorMessage.java
@@ -61,7 +61,7 @@ public class ErrorMessage implements Runnable {
                 message.append(e.getClass().getSimpleName());
             e = e.getCause();
             if (e != null)
-                message.append("\ncaused by: ");
+                message.append("\n").append(Lang.get("msg_errCausedBy")).append(": ");
         }
     }
 
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index d8cbae9bf..232c2af78 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -529,6 +529,7 @@ Sind evtl. die Namen der Variablen nicht eindeutig?</string>
     <string name="err_MultiBitFlipFlopFound">Es sind keine Flipflops mit mehr als einem Bit erlaubt!</string>
     <string name="err_invalidTransmissionGateState">Die Steuereingänge eines Transmission-Gates müssen invertiert beschaltet werden!</string>
     <string name="err_nameUsedTwice_N">Signal {0} wurde mehrfach verwendet!</string>
+    <string name="err_errorParsingTestdata">Fehler beim Einlesen der Testdaten.</string>
 
     <string name="key_AddrBits">Adress-Bits</string>
     <string name="key_AddrBits_tt">Anzahl der Adress-Bits die verwendet werden.</string>
@@ -870,6 +871,7 @@ Die Icons stammen aus dem Tango Desktop Project.</string>
     <string name="btn_gifComplete">Fertig</string>
     <string name="btn_gifComplete_tt">Die GIF-Datei wird abgeschlossen.</string>
     <string name="msg_gifExport">GIF-Export</string>
+    <string name="msg_errCausedBy">verursacht durch</string>
 
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>
diff --git a/src/main/resources/lang/lang_en.xml b/src/main/resources/lang/lang_en.xml
index 2e0a20781..7901d6ddc 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -429,8 +429,8 @@
     <string name="error">Error</string>
     <string name="err_N_isNotInputOrOutput">Pin {0} in component {1} is not a input or output</string>
     <string name="err_aSingleClockNecessary">A single clock component is necessary. All flip-flops must use this clock signal.</string>
-    <string name="err_analyseNoInputs">The circuit has no Inputs</string>
-    <string name="err_analyseNoOutputs">The circuit has no outputs</string>
+    <string name="err_analyseNoInputs">The circuit has no labeled inputs</string>
+    <string name="err_analyseNoOutputs">The circuit has no labeled outputs</string>
     <string name="err_breakTimeOut">Break timeout after {0} cycles</string>
     <string name="err_builder_exprNotSupported">Expression {0} not supported</string>
     <string name="err_builder_operationNotSupported">Operation {0} not supported</string>
@@ -519,6 +519,7 @@ The names of the variables may not be unique.</string>
     <string name="err_MultiBitFlipFlopFound">Flipflops with more then one bits are not allowed!</string>
     <string name="err_invalidTransmissionGateState">The two control inputs of a transmission gate must be inverted!</string>
     <string name="err_nameUsedTwice_N">Signal {0} is used twice!</string>
+    <string name="err_errorParsingTestdata">Error parsing the test data.</string>
 
     <string name="key_AddrBits">Address Bits</string>
     <string name="key_AddrBits_tt">Number of address bits used.</string>
@@ -858,6 +859,7 @@ The icons are taken from the Tango Desktop Project.</string>
     <string name="btn_gifComplete">Ready</string>
     <string name="btn_gifComplete_tt">The GIF file is finalized and closed.</string>
     <string name="msg_gifExport">GIF Export</string>
+    <string name="msg_errCausedBy">caused by</string>
 
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>