diff --git a/source/net/filebot/media/MediaDetection.java b/source/net/filebot/media/MediaDetection.java
index cd2ffb93..d16bc545 100644
--- a/source/net/filebot/media/MediaDetection.java
+++ b/source/net/filebot/media/MediaDetection.java
@@ -117,7 +117,7 @@ public class MediaDetection {
 
 	private static final SeasonEpisodeMatcher seasonEpisodeMatcherStrict = new SmartSeasonEpisodeMatcher(true);
 	private static final SeasonEpisodeMatcher seasonEpisodeMatcherNonStrict = new SmartSeasonEpisodeMatcher(false);
-	private static final DateMatcher dateMatcher = new DateMatcher(Locale.ROOT, DateMatcher.DEFAULT_SANITY);
+	private static final DateMatcher dateMatcher = new DateMatcher(Locale.getDefault(), DateMatcher.DEFAULT_SANITY);
 
 	public static SeasonEpisodeMatcher getSeasonEpisodeMatcher(boolean strict) {
 		return strict ? seasonEpisodeMatcherStrict : seasonEpisodeMatcherNonStrict;
diff --git a/source/net/filebot/media/ReleaseInfo.java b/source/net/filebot/media/ReleaseInfo.java
index c89bc813..d55689b9 100644
--- a/source/net/filebot/media/ReleaseInfo.java
+++ b/source/net/filebot/media/ReleaseInfo.java
@@ -576,12 +576,11 @@ public class ReleaseInfo {
 
 	public Map<String, Locale> getLanguageMap(Locale... supportedDisplayLocale) {
 		// use maximum strength collator by default
-		Collator collator = Collator.getInstance(Locale.ROOT);
+		Collator collator = Collator.getInstance(Locale.ENGLISH);
 		collator.setDecomposition(Collator.FULL_DECOMPOSITION);
 		collator.setStrength(Collator.PRIMARY);
 
-		@SuppressWarnings("unchecked")
-		Comparator<String> order = (Comparator) collator;
+		Comparator<? super String> order = collator;
 		Map<String, Locale> languageMap = new TreeMap<String, Locale>(order);
 
 		for (String code : Locale.getISOLanguages()) {
diff --git a/source/net/filebot/similarity/EpisodeMetrics.java b/source/net/filebot/similarity/EpisodeMetrics.java
index 5795e3cd..2ecc12a8 100644
--- a/source/net/filebot/similarity/EpisodeMetrics.java
+++ b/source/net/filebot/similarity/EpisodeMetrics.java
@@ -303,7 +303,7 @@ public enum EpisodeMetrics implements SimilarityMetric {
 	// Match by generic name similarity (absolute)
 	SeriesName(new NameSimilarityMetric() {
 
-		private SeriesNameMatcher seriesNameMatcher = new SeriesNameMatcher(Locale.ROOT, false);
+		private SeriesNameMatcher seriesNameMatcher = new SeriesNameMatcher(Locale.ENGLISH, false);
 
 		@Override
 		public float getSimilarity(Object o1, Object o2) {
diff --git a/source/net/filebot/similarity/SequenceMatchSimilarity.java b/source/net/filebot/similarity/SequenceMatchSimilarity.java
index 13768b73..28d51aa9 100644
--- a/source/net/filebot/similarity/SequenceMatchSimilarity.java
+++ b/source/net/filebot/similarity/SequenceMatchSimilarity.java
@@ -15,7 +15,7 @@ public class SequenceMatchSimilarity implements SimilarityMetric {
 	}
 
 	public SequenceMatchSimilarity(int commonSequenceMaxStartIndex, boolean returnFirstMatch) {
-		this.commonSequenceMatcher = new CommonSequenceMatcher(getLenientCollator(Locale.ROOT), commonSequenceMaxStartIndex, returnFirstMatch);
+		this.commonSequenceMatcher = new CommonSequenceMatcher(getLenientCollator(Locale.ENGLISH), commonSequenceMaxStartIndex, returnFirstMatch);
 	}
 
 	@Override
diff --git a/source/net/filebot/similarity/SeriesNameMatcher.java b/source/net/filebot/similarity/SeriesNameMatcher.java
index 79f864c0..360486e2 100644
--- a/source/net/filebot/similarity/SeriesNameMatcher.java
+++ b/source/net/filebot/similarity/SeriesNameMatcher.java
@@ -38,7 +38,7 @@ public class SeriesNameMatcher {
 	protected CommonSequenceMatcher commonSequenceMatcher;
 
 	public SeriesNameMatcher() {
-		this(Locale.ROOT, true);
+		this(Locale.ENGLISH, true);
 	}
 
 	public SeriesNameMatcher(Locale locale, boolean strict) {
diff --git a/source/net/filebot/ui/rename/EpisodeListMatcher.java b/source/net/filebot/ui/rename/EpisodeListMatcher.java
index 7b68cf8c..0d2ce491 100644
--- a/source/net/filebot/ui/rename/EpisodeListMatcher.java
+++ b/source/net/filebot/ui/rename/EpisodeListMatcher.java
@@ -180,8 +180,8 @@ class EpisodeListMatcher implements AutoCompleteMatcher {
 		List<Callable<List<Match<File, ?>>>> tasks = new ArrayList<Callable<List<Match<File, ?>>>>();
 
 		// remember user decisions and only bother user once
-		final Map<String, SearchResult> selectionMemory = new TreeMap<String, SearchResult>(CommonSequenceMatcher.getLenientCollator(Locale.ROOT));
-		final Map<String, List<String>> inputMemory = new TreeMap<String, List<String>>(CommonSequenceMatcher.getLenientCollator(Locale.ROOT));
+		final Map<String, SearchResult> selectionMemory = new TreeMap<String, SearchResult>(CommonSequenceMatcher.getLenientCollator(Locale.ENGLISH));
+		final Map<String, List<String>> inputMemory = new TreeMap<String, List<String>>(CommonSequenceMatcher.getLenientCollator(Locale.ENGLISH));
 
 		// detect series names and create episode list fetch tasks
 		if (strict) {