diff --git a/docs/changelog.rst b/docs/changelog.rst
index c394f2b4..04c5eaa1 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -46,6 +46,11 @@ v0.17.0 (UNRELEASED)
 - Fix scanner so that time of last modification is respected when deciding
   which files can be skipped.
 
+- The scanner now ignores the capitalization of file extensions in
+  :confval:`local/excluded_file_extensions`, so you no longer need to list both
+  ``.jpg`` and ``.JPG`` to ignore JPEG files when scanning. (Fixes:
+  :issue:`525`)
+
 **MPD frontend**
 
 - The MPD service is now published as a Zeroconf service if avahi-daemon is
@@ -58,6 +63,9 @@ v0.17.0 (UNRELEASED)
   ``performer``.  These tags can be used with ``list ...``, ``search ...``, and
   ``find ...`` and their variants, and are supported in the ``any`` tag also
 
+- The ``bitrate`` field in the ``status`` response is now always an integer.
+  This follows the behavior of the original MPD server. (Fixes: :issue:`577`)
+
 **HTTP frontend**
 
 - The HTTP service is now published as a Zeroconf service if avahi-daemon is
diff --git a/mopidy/backends/local/commands.py b/mopidy/backends/local/commands.py
index 601243d0..9afedf5f 100644
--- a/mopidy/backends/local/commands.py
+++ b/mopidy/backends/local/commands.py
@@ -29,7 +29,8 @@ class ScanCommand(commands.Command):
     def run(self, args, config, extensions):
         media_dir = config['local']['media_dir']
         scan_timeout = config['local']['scan_timeout']
-        excluded_file_extensions = config['local']['excluded_file_extensions']
+        excluded_file_extensions = set(
+            ext.lower() for ext in config['local']['excluded_file_extensions'])
 
         updaters = {}
         for e in extensions:
@@ -73,7 +74,7 @@ class ScanCommand(commands.Command):
         logger.info('Checking %s for unknown tracks.', media_dir)
         for uri in path.find_uris(media_dir):
             file_extension = os.path.splitext(path.uri_to_path(uri))[1]
-            if file_extension in excluded_file_extensions:
+            if file_extension.lower() in excluded_file_extensions:
                 logger.debug('Skipped %s: File extension excluded.', uri)
                 continue
 
diff --git a/mopidy/frontends/mpd/protocol/status.py b/mopidy/frontends/mpd/protocol/status.py
index 49e08ee8..deb5d503 100644
--- a/mopidy/frontends/mpd/protocol/status.py
+++ b/mopidy/frontends/mpd/protocol/status.py
@@ -214,8 +214,11 @@ def status(context):
 
 def _status_bitrate(futures):
     current_tl_track = futures['playback.current_tl_track'].get()
-    if current_tl_track is not None:
-        return current_tl_track.track.bitrate
+    if current_tl_track is None:
+        return 0
+    if current_tl_track.track.bitrate is None:
+        return 0
+    return current_tl_track.track.bitrate
 
 
 def _status_consume(futures):
diff --git a/mopidy/frontends/mpd/translator.py b/mopidy/frontends/mpd/translator.py
index e103e170..e4fb0d62 100644
--- a/mopidy/frontends/mpd/translator.py
+++ b/mopidy/frontends/mpd/translator.py
@@ -322,6 +322,12 @@ def _add_to_tag_cache(result, dirs, files, media_dir):
     for track in files:
         track_result = dict(track_to_mpd_format(track))
 
+        # XXX Don't save comments to the tag cache as they may span multiple
+        # lines. We'll start saving track comments when we move from tag_cache
+        # to a JSON file. See #579 for details.
+        if 'Comment' in track_result:
+            del track_result['Comment']
+
         path = uri_to_path(track_result['file'])
         try:
             text_path = path.decode('utf-8')
diff --git a/mopidy/utils/zeroconf.py b/mopidy/utils/zeroconf.py
index c1781867..33fbd13b 100644
--- a/mopidy/utils/zeroconf.py
+++ b/mopidy/utils/zeroconf.py
@@ -1,11 +1,10 @@
 from __future__ import unicode_literals
 
 import logging
-import re
 import socket
 import string
 
-logger = logging.getLogger('mopidy.utils.zerconf')
+logger = logging.getLogger('mopidy.utils.zeroconf')
 
 try:
     import dbus
@@ -17,13 +16,6 @@ _AVAHI_PROTO_UNSPEC = -1
 _AVAHI_PUBLISHFLAGS_NONE = 0
 
 
-def _filter_loopback_and_meta_addresses(host):
-    # TODO: see if we can find a cleaner way of handling this.
-    if re.search(r'(?<![.\d])(127|0)[.]', host):
-        return ''
-    return host
-
-
 def _convert_text_to_dbus_bytes(text):
     return [dbus.Byte(ord(c)) for c in text]
 
@@ -38,7 +30,10 @@ class Zeroconf(object):
         self.domain = domain or ''
         self.port = port
         self.text = text or []
-        self.host = _filter_loopback_and_meta_addresses(host or '')
+        if host in ('::', '0.0.0.0'):
+            self.host = ''
+        else:
+            self.host = host
 
         template = string.Template(name)
         self.name = template.safe_substitute(
@@ -51,31 +46,38 @@ class Zeroconf(object):
 
         try:
             bus = dbus.SystemBus()
+
+            if not bus.name_has_owner('org.freedesktop.Avahi'):
+                logger.debug(
+                    'Zeroconf publish failed: Avahi service not running.')
+                return False
+
+            server = dbus.Interface(
+                bus.get_object('org.freedesktop.Avahi', '/'),
+                'org.freedesktop.Avahi.Server')
+
+            self.group = dbus.Interface(
+                bus.get_object(
+                    'org.freedesktop.Avahi', server.EntryGroupNew()),
+                'org.freedesktop.Avahi.EntryGroup')
+
+            text = [_convert_text_to_dbus_bytes(t) for t in self.text]
+            self.group.AddService(
+                _AVAHI_IF_UNSPEC, _AVAHI_PROTO_UNSPEC,
+                dbus.UInt32(_AVAHI_PUBLISHFLAGS_NONE), self.name, self.stype,
+                self.domain, self.host, dbus.UInt16(self.port), text)
+
+            self.group.Commit()
+            return True
         except dbus.exceptions.DBusException as e:
             logger.debug('Zeroconf publish failed: %s', e)
             return False
 
-        if not bus.name_has_owner('org.freedesktop.Avahi'):
-            logger.debug('Zeroconf publish failed: Avahi service not running.')
-            return False
-
-        server = dbus.Interface(bus.get_object('org.freedesktop.Avahi', '/'),
-                                'org.freedesktop.Avahi.Server')
-
-        self.group = dbus.Interface(
-            bus.get_object('org.freedesktop.Avahi', server.EntryGroupNew()),
-            'org.freedesktop.Avahi.EntryGroup')
-
-        text = [_convert_text_to_dbus_bytes(t) for t in self.text]
-        self.group.AddService(_AVAHI_IF_UNSPEC, _AVAHI_PROTO_UNSPEC,
-                              dbus.UInt32(_AVAHI_PUBLISHFLAGS_NONE),
-                              self.name, self.stype, self.domain, self.host,
-                              dbus.UInt16(self.port), text)
-
-        self.group.Commit()
-        return True
-
     def unpublish(self):
         if self.group:
-            self.group.Reset()
-            self.group = None
+            try:
+                self.group.Reset()
+            except dbus.exceptions.DBusException as e:
+                logger.debug('Zeroconf unpublish failed: %s', e)
+            finally:
+                self.group = None