diff --git a/src/com/bytezone/diskbrowser/disk/AppleDisk.java b/src/com/bytezone/diskbrowser/disk/AppleDisk.java
index b539544..20ed639 100755
--- a/src/com/bytezone/diskbrowser/disk/AppleDisk.java
+++ b/src/com/bytezone/diskbrowser/disk/AppleDisk.java
@@ -619,7 +619,12 @@ public class AppleDisk implements Disk
   {
     StringBuilder text = new StringBuilder ();
 
-    text.append (String.format ("Path............ %s%n", file.getAbsolutePath ()));
+    String path = file.getAbsolutePath ();
+    String home = System.getProperty ("user.home");
+    if (path.startsWith (home))
+      path = "~" + path.substring (home.length ());
+
+    text.append (String.format ("Path............ %s%n", path));
     text.append (String.format ("File name....... %s%n", file.getName ()));
     text.append (String.format ("File size....... %,d%n", file.length ()));
     text.append (String.format ("Tracks.......... %d%n", tracks));
diff --git a/src/com/bytezone/diskbrowser/dos/DosDisk.java b/src/com/bytezone/diskbrowser/dos/DosDisk.java
index 0d58d24..70e5fcd 100755
--- a/src/com/bytezone/diskbrowser/dos/DosDisk.java
+++ b/src/com/bytezone/diskbrowser/dos/DosDisk.java
@@ -296,7 +296,10 @@ public class DosDisk extends AbstractFormattedDisk
     //      return 0;
 
     if (buffer[53] != 16 && buffer[53] != 13)         // tracks per sector
+    {
+      System.out.printf ("%02X tracks per sector%n", buffer[53]);
       return 0;
+    }
 
     //    if (buffer[49] < -1 || buffer[49] > 1)      // direction of next file save
     //    {
diff --git a/src/com/bytezone/diskbrowser/gui/TreeBuilder.java b/src/com/bytezone/diskbrowser/gui/TreeBuilder.java
index 87c0db8..63a5dd2 100755
--- a/src/com/bytezone/diskbrowser/gui/TreeBuilder.java
+++ b/src/com/bytezone/diskbrowser/gui/TreeBuilder.java
@@ -168,7 +168,11 @@ public class TreeBuilder
     {
       StringBuilder text = new StringBuilder ();
 
-      text.append ("Directory : " + file.getAbsolutePath () + "\n\n");
+      String home = System.getProperty ("user.home");
+      String path = file.getAbsolutePath ();
+      if (path.startsWith (home))
+        path = "~" + path.substring (home.length ());
+      text.append ("Directory : " + path + "\n\n");
       text.append ("D         File names                       "
           + "      Date               Size  Type\n");
       text.append ("-  ----------------------------------------"
@@ -178,9 +182,11 @@ public class TreeBuilder
       if (files != null)
         for (File f : files)
         {
-          String name = f.getName ();
-          if (name.startsWith ("."))
+          if (f.isHidden ())
             continue;
+          String name = f.getName ();
+          //          if (name.startsWith ("."))
+          //            continue;
 
           Date d = new Date (f.lastModified ());
           int pos = name.lastIndexOf ('.');
diff --git a/src/com/bytezone/diskbrowser/nib/WozFile.java b/src/com/bytezone/diskbrowser/nib/WozFile.java
index 09af137..db5d48d 100644
--- a/src/com/bytezone/diskbrowser/nib/WozFile.java
+++ b/src/com/bytezone/diskbrowser/nib/WozFile.java
@@ -7,6 +7,7 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
+import com.bytezone.diskbrowser.utilities.HexFormatter;
 import com.bytezone.diskbrowser.utilities.Utility;
 
 public class WozFile
@@ -41,7 +42,10 @@ public class WozFile
     boolean valid = false;
 
     if (!matches (WOZ1_FILE_HEADER, buffer))
+    {
+      System.out.println (HexFormatter.format (buffer, 0, 20));
       throw new DiskNibbleException ("Header error");
+    }
 
     int checksum1 = readInt (buffer, 8, 4);
     int checksum2 = Utility.crc32 (buffer, 12, buffer.length - 12);
diff --git a/src/com/bytezone/diskbrowser/utilities/NuFX.java b/src/com/bytezone/diskbrowser/utilities/NuFX.java
index ce5ed5e..6bd452c 100644
--- a/src/com/bytezone/diskbrowser/utilities/NuFX.java
+++ b/src/com/bytezone/diskbrowser/utilities/NuFX.java
@@ -91,7 +91,7 @@ public class NuFX
     {
       crc = ((crc >>> 8) | (crc << 8)) & 0xFFFF;
       crc ^= (buffer[j] & 0xFF);
-      crc ^= ((crc & 0xFF) >> 4);
+      crc ^= ((crc & 0xFF) >>> 4);
       crc ^= (crc << 12) & 0xFFFF;
       crc ^= ((crc & 0xFF) << 5) & 0xFFFF;
     }