diff --git a/app/src/main/assets/ReadMe.txt b/app/src/main/assets/ReadMe.txt
index 7c145df..5147d52 100644
--- a/app/src/main/assets/ReadMe.txt
+++ b/app/src/main/assets/ReadMe.txt
@@ -26,6 +26,7 @@ QUICK START
 
 NOTES
 
+- The Help menu displays Emu48's original help HTML page and may not accurately reflect the behavior of this Android version.
 - When using a custom KML script by selecting a folder, you must take care of the case sensitivity of its dependency files.
 - Starting with the version 1.4, a RAM card generator for the port 2 of the HP48SX and HP48GX has been added.
   Like with the MKSHARED.EXE on Windows, you can generate the card in a file (i.e.: SHARED.BIN).
@@ -123,7 +124,7 @@ Version 1.0 (2019-02-28)
 
 LICENSES
 
-Android version by Régis COSNIER.
+Android version by Régis COSNIER.
 This program is based on Emu48 for Windows version, copyrighted by Christoph Gießelink & Sébastien Carlier, with the addition of a win32 layer to run on Android.
 
 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
diff --git a/app/src/main/java/org/emulator/forty/eight/MainActivity.java b/app/src/main/java/org/emulator/forty/eight/MainActivity.java
index d9f66a5..c343cf1 100644
--- a/app/src/main/java/org/emulator/forty/eight/MainActivity.java
+++ b/app/src/main/java/org/emulator/forty/eight/MainActivity.java
@@ -1378,9 +1378,8 @@ public class MainActivity extends AppCompatActivity implements NavigationView.On
 //                            sharedPreferences.getBoolean("settings_allow_sound", true) ? 64 : 0, 0, null);
 //                    break;
                 case "settings_sound_volume": {
-                    float volumeOption = sharedPreferences.getInt("settings_sound_volume", 25);
-                    int volumeValue = (int)((volumeOption * 255.0f) / 100.0f);
-                    NativeLib.setConfiguration("settings_sound_volume", isDynamicValue, volumeValue, 0, null);
+                    int volumeOption = sharedPreferences.getInt("settings_sound_volume", 64);
+                    NativeLib.setConfiguration("settings_sound_volume", isDynamicValue, volumeOption, 0, null);
                     break;
                 }
                 case "settings_haptic_feedback":
diff --git a/app/src/main/java/org/emulator/forty/eight/MainScreenView.java b/app/src/main/java/org/emulator/forty/eight/MainScreenView.java
index 67eae17..0c5fe26 100644
--- a/app/src/main/java/org/emulator/forty/eight/MainScreenView.java
+++ b/app/src/main/java/org/emulator/forty/eight/MainScreenView.java
@@ -243,7 +243,7 @@ public class MainScreenView extends PanAndScaleView {
     }
 
     protected void updateLayout() {
-        if(bitmapMainScreen != null) {
+        if(bitmapMainScreen != null && virtualSizeHeight > 1) {
             if (virtualSizeWidth > 0.0f && viewSizeWidth > 0.0f) {
                 float imageRatio = virtualSizeHeight / virtualSizeWidth;
                 float viewRatio = viewSizeHeight / viewSizeWidth;
diff --git a/app/src/main/res/xml/pref_general.xml b/app/src/main/res/xml/pref_general.xml
index 72a3579..003750b 100644
--- a/app/src/main/res/xml/pref_general.xml
+++ b/app/src/main/res/xml/pref_general.xml
@@ -63,9 +63,9 @@
             <SeekBarPreference
                 android:key="settings_sound_volume"
                 android:title="@string/settings_sound_volume_title"
-                android:defaultValue="25"
+                android:defaultValue="64"
                 android:min="0"
-                android:max="100"
+                android:max="255"
                 app:showSeekBarValue="true" />
             <SwitchPreference
                 android:key="settings_haptic_feedback"