diff --git a/app/build.gradle b/app/build.gradle
index 6d3a924c57..453550794a 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -112,7 +112,7 @@ dependencies {
     provided "frankiesardo:icepick-processor:$ICEPICK_VERSION"
     compile 'com.github.dmytrodanylyk.android-process-button:library:1.0.4'
     compile 'eu.davidea:flexible-adapter:4.2.0@aar'
-    compile 'com.nononsenseapps:filepicker:2.5.0'
+    compile 'com.nononsenseapps:filepicker:2.5.1'
     compile 'com.amulyakhare:com.amulyakhare.textdrawable:1.0.1'
     compile 'com.github.pwittchen:reactivenetwork:0.1.5'
 
@@ -121,7 +121,7 @@ dependencies {
     apt "com.pushtorefresh.storio:sqlite-annotations-processor:$STORIO_VERSION"
     provided 'org.glassfish:javax.annotation:10.0-b28'
 
-    compile('com.mikepenz:materialdrawer:4.6.1@aar') {
+    compile('com.mikepenz:materialdrawer:4.6.4@aar') {
         transitive = true
     }
     compile('com.github.afollestad.material-dialogs:core:0.8.5.3@aar') {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadManager.java b/app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadManager.java
index aafe36d660..ab553a0718 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadManager.java
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadManager.java
@@ -13,6 +13,7 @@ import java.io.FileOutputStream;
 import java.io.FileReader;
 import java.io.IOException;
 import java.lang.reflect.Type;
+import java.util.ArrayList;
 import java.util.List;
 
 import eu.kanade.tachiyomi.data.database.models.Chapter;
@@ -42,10 +43,8 @@ public class DownloadManager {
     private Gson gson;
 
     private PublishSubject<Download> downloadsQueueSubject;
-    private BehaviorSubject<Integer> threadsNumber;
     private BehaviorSubject<Boolean> runningSubject;
     private Subscription downloadsSubscription;
-    private Subscription threadsNumberSubscription;
 
     private DownloadQueue queue;
     private volatile boolean isRunning;
@@ -61,7 +60,6 @@ public class DownloadManager {
         queue = new DownloadQueue();
 
         downloadsQueueSubject = PublishSubject.create();
-        threadsNumber = BehaviorSubject.create();
         runningSubject = BehaviorSubject.create();
     }
 
@@ -69,14 +67,8 @@ public class DownloadManager {
         if (downloadsSubscription != null && !downloadsSubscription.isUnsubscribed())
             downloadsSubscription.unsubscribe();
 
-        if (threadsNumberSubscription != null && !threadsNumberSubscription.isUnsubscribed())
-            threadsNumberSubscription.unsubscribe();
-
-        threadsNumberSubscription = preferences.downloadThreads().asObservable()
-                .subscribe(threadsNumber::onNext);
-
         downloadsSubscription = downloadsQueueSubject
-                .lift(new DynamicConcurrentMergeOperator<>(this::downloadChapter, threadsNumber))
+                .flatMap(this::downloadChapter, preferences.downloadThreads())
                 .onBackpressureBuffer()
                 .observeOn(AndroidSchedulers.mainThread())
                 .map(download -> areAllDownloadsFinished())
@@ -102,11 +94,6 @@ public class DownloadManager {
             downloadsSubscription.unsubscribe();
             downloadsSubscription = null;
         }
-
-        if (threadsNumberSubscription != null && !threadsNumberSubscription.isUnsubscribed()) {
-            threadsNumberSubscription.unsubscribe();
-            threadsNumberSubscription = null;
-        }
     }
 
     // Create a download object for every chapter in the event and add them to the downloads queue
@@ -114,7 +101,14 @@ public class DownloadManager {
         final Manga manga = event.getManga();
         final Source source = sourceManager.get(manga.source);
 
+        // Used to avoid downloading chapters with the same name
+        final List<String> addedChapters = new ArrayList<>();
+
         for (Chapter chapter : event.getChapters()) {
+            if (addedChapters.contains(chapter.name))
+                continue;
+
+            addedChapters.add(chapter.name);
             Download download = new Download(source, manga, chapter);
 
             if (!prepareDownload(download)) {
@@ -362,7 +356,7 @@ public class DownloadManager {
                 File.separator +
                 manga.title.replaceAll("[^\\sa-zA-Z0-9.-]", "_") +
                 File.separator +
-                chapter.name.replaceAll("[^\\sa-zA-Z0-9.-]", "_") + " (" + chapter.id + ")";
+                chapter.name.replaceAll("[^\\sa-zA-Z0-9.-]", "_");
 
         return new File(preferences.getDownloadsDirectory(), chapterRelativePath);
     }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.java b/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.java
index d79b1c7f3f..896883c4dd 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.java
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.java
@@ -85,8 +85,7 @@ public class PreferencesHelper {
     }
 
     public int getDefaultViewer() {
-        // TODO use IntListPreference
-        return Integer.parseInt(prefs.getString(getKey(R.string.pref_default_viewer_key), "1"));
+        return prefs.getInt(getKey(R.string.pref_default_viewer_key), 1);
     }
 
     public Preference<Integer> portraitColumns() {
@@ -156,8 +155,8 @@ public class PreferencesHelper {
         prefs.edit().putString(getKey(R.string.pref_download_directory_key), path).apply();
     }
 
-    public Preference<Integer> downloadThreads() {
-        return rxPrefs.getInteger(getKey(R.string.pref_download_slots_key), 1);
+    public int downloadThreads() {
+        return prefs.getInt(getKey(R.string.pref_download_slots_key), 1);
     }
 
     public boolean downloadOnlyOverWifi() {
diff --git a/app/src/main/res/xml/pref_reader.xml b/app/src/main/res/xml/pref_reader.xml
index 23fa857d02..ac2c279458 100644
--- a/app/src/main/res/xml/pref_reader.xml
+++ b/app/src/main/res/xml/pref_reader.xml
@@ -21,7 +21,8 @@
         android:key="@string/pref_custom_brightness_key"
         android:defaultValue="false" />
 
-    <ListPreference android:title="@string/pref_viewer_type"
+    <eu.kanade.tachiyomi.widget.preference.IntListPreference
+        android:title="@string/pref_viewer_type"
         android:key="@string/pref_default_viewer_key"
         android:entries="@array/viewers"
         android:entryValues="@array/viewers_values"
diff --git a/build.gradle b/build.gradle
index ee0d8ee2c8..c1b713e11c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ buildscript {
         classpath 'com.jakewharton.sdkmanager:gradle-plugin:0.12.+'
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
         classpath 'me.tatarka:gradle-retrolambda:3.2.4'
-        classpath 'com.github.ben-manes:gradle-versions-plugin:0.11.3'
+        classpath 'com.github.ben-manes:gradle-versions-plugin:0.12.0'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }