diff --git a/key.core/src/main/java/de/uka/ilkd/key/settings/Configuration.java b/key.core/src/main/java/de/uka/ilkd/key/settings/Configuration.java
index 8efef1a3e1..b6dbb981ec 100644
--- a/key.core/src/main/java/de/uka/ilkd/key/settings/Configuration.java
+++ b/key.core/src/main/java/de/uka/ilkd/key/settings/Configuration.java
@@ -525,7 +525,7 @@ private ConfigurationWriter printMap(Map<?, ?> value) {
             }
             indent -= 4;
             newline().printIndent();
-            out.format(" }");
+            out.format("}");
             return this;
         }
 
@@ -555,7 +555,7 @@ private ConfigurationWriter printSeq(Collection<?> value) {
             }
             indent -= 4;
             newline().printIndent();
-            out.format(" ]");
+            out.format("]");
             return this;
         }
 
diff --git a/key.core/src/main/java/de/uka/ilkd/key/settings/ProofIndependentSettings.java b/key.core/src/main/java/de/uka/ilkd/key/settings/ProofIndependentSettings.java
index 0646074f4a..482e346067 100644
--- a/key.core/src/main/java/de/uka/ilkd/key/settings/ProofIndependentSettings.java
+++ b/key.core/src/main/java/de/uka/ilkd/key/settings/ProofIndependentSettings.java
@@ -53,8 +53,8 @@ public class ProofIndependentSettings {
     private final List<Settings> settings = new LinkedList<>();
 
     private final PropertyChangeListener settingsListener = e -> saveSettings();
-    private Properties lastReadedProperties;
-    private Configuration lastReadedConfiguration;
+    private Properties lastReadProperties;
+    private Configuration lastReadConfiguration;
 
     private ProofIndependentSettings() {
         addSettings(smtSettings);
@@ -74,11 +74,11 @@ public void addSettings(Settings settings) {
         if (!this.settings.contains(settings)) {
             this.settings.add(settings);
             settings.addPropertyChangeListener(settingsListener);
-            if (lastReadedProperties != null) {
-                settings.readSettings(lastReadedProperties);
+            if (lastReadProperties != null) {
+                settings.readSettings(lastReadProperties);
             }
-            if (lastReadedConfiguration != null) {
-                settings.readSettings(lastReadedConfiguration);
+            if (lastReadConfiguration != null) {
+                settings.readSettings(lastReadConfiguration);
             }
         }
     }
@@ -106,19 +106,22 @@ private void load(File file) throws IOException {
                 for (Settings settings : settings) {
                     settings.readSettings(properties);
                 }
-                lastReadedProperties = properties;
+                lastReadProperties = properties;
             }
         } else {
-            this.lastReadedConfiguration = Configuration.load(file);
+            this.lastReadConfiguration = Configuration.load(file);
             for (Settings settings : settings) {
-                settings.readSettings(lastReadedConfiguration);
+                settings.readSettings(lastReadConfiguration);
             }
         }
     }
 
     public void saveSettings() {
         if (!filename.getName().endsWith(".json")) {
-            Properties result = new Properties();
+            Properties result = lastReadProperties == null
+                    ? new Properties()
+                    : new Properties(lastReadProperties);
+
             for (Settings settings : settings) {
                 settings.writeSettings(result);
             }
@@ -135,6 +138,10 @@ public void saveSettings() {
         }
 
         Configuration config = new Configuration();
+        if (lastReadConfiguration != null) {
+            config.overwriteWith(lastReadConfiguration);
+        }
+
         for (var settings : settings)
             settings.writeSettings(config);
         if (!filename.exists()) {
diff --git a/key.ui/src/main/java/de/uka/ilkd/key/gui/plugins/javac/JavacExtension.java b/key.ui/src/main/java/de/uka/ilkd/key/gui/plugins/javac/JavacExtension.java
index 009a53a28d..622024a97e 100644
--- a/key.ui/src/main/java/de/uka/ilkd/key/gui/plugins/javac/JavacExtension.java
+++ b/key.ui/src/main/java/de/uka/ilkd/key/gui/plugins/javac/JavacExtension.java
@@ -162,6 +162,9 @@ private void loadProof(Proof selectedProof) throws RuntimeException {
                     updateLabel(data);
                 })).get();
             } catch (InterruptedException | ExecutionException ex) {
+                lblStatus.setForeground(COLOR_ERROR.get());
+                lblStatus.setIcon(ICON_ERROR.get(16));
+                lblStatus.setText("Javac error");
                 throw new RuntimeException(ex);
             }
         }