diff --git a/source/net/sourceforge/filebot/ui/panel/rename/metric/NumericSimilarityMetric.java b/source/net/sourceforge/filebot/ui/panel/rename/metric/NumericSimilarityMetric.java
index 20b3d513..ebb4e90b 100644
--- a/source/net/sourceforge/filebot/ui/panel/rename/metric/NumericSimilarityMetric.java
+++ b/source/net/sourceforge/filebot/ui/panel/rename/metric/NumericSimilarityMetric.java
@@ -21,7 +21,7 @@ public class NumericSimilarityMetric extends AbstractNameSimilarityMetric {
 	
 	public NumericSimilarityMetric() {
 		// I have absolutely no clue as to why, but I get a good matching behavior  
-		// when using my NumberTokensier with EuclideanDistance
+		// when using a numeric tokensier with EuclideanDistance
 		metric = new EuclideanDistance(new NumberTokeniser());
 	}
 	
diff --git a/source/net/sourceforge/filebot/ui/panel/subtitle/Unrar.java b/source/net/sourceforge/filebot/ui/panel/subtitle/Unrar.java
index 1c38fe30..40715e64 100644
--- a/source/net/sourceforge/filebot/ui/panel/subtitle/Unrar.java
+++ b/source/net/sourceforge/filebot/ui/panel/subtitle/Unrar.java
@@ -80,6 +80,7 @@ public class Unrar {
 				
 				throw new FileNotFoundException("External program not found");
 			} else {
+				// linux, bsd, mac, ...
 				String command = "unrar";
 				
 				// will throw an exception if command cannot be executed
@@ -119,8 +120,8 @@ public class Unrar {
 			
 			Process process = builder.start();
 			
-			// make sure process is non-interactive
-			// e.g. if input stream is not closed 7z.exe sometimes doesn't exit 
+			// if output stream is open, but not read, the subprocess may block due to limited buffer size,
+			// so we close all streams just in case
 			process.getInputStream().close();
 			process.getOutputStream().close();
 			process.getErrorStream().close();
diff --git a/source/net/sourceforge/filebot/web/SubsceneSubtitleDescriptor.java b/source/net/sourceforge/filebot/web/SubsceneSubtitleDescriptor.java
index fcff0bbc..487ce372 100644
--- a/source/net/sourceforge/filebot/web/SubsceneSubtitleDescriptor.java
+++ b/source/net/sourceforge/filebot/web/SubsceneSubtitleDescriptor.java
@@ -3,6 +3,7 @@ package net.sourceforge.filebot.web;
 
 
 import java.net.URL;
+import java.util.Collections;
 
 import net.sourceforge.tuned.DownloadTask;
 
@@ -50,7 +51,7 @@ public class SubsceneSubtitleDescriptor implements SubtitleDescriptor {
 	@Override
 	public DownloadTask createDownloadTask() {
 		DownloadTask downloadTask = new DownloadTask(downloadUrl);
-		downloadTask.setRequestHeader("Referer", referer.toString());
+		downloadTask.setRequestHeaders(Collections.singletonMap("Referer", referer.toString()));
 		
 		return downloadTask;
 	}