diff --git a/plugins/ChannelStats/plugin.py b/plugins/ChannelStats/plugin.py
index 028e05335..6dc0a5520 100644
--- a/plugins/ChannelStats/plugin.py
+++ b/plugins/ChannelStats/plugin.py
@@ -249,6 +249,9 @@ class ChannelStats(callbacks.Plugin):
         necessary if the message isn't sent on the channel itself.  If <name>
         isn't given, it defaults to the user sending the command.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         if name and ircutils.strEqual(name, irc.nick):
             id = 0
         elif not name:
@@ -310,6 +313,9 @@ class ChannelStats(callbacks.Plugin):
         'kicks', 'kicked', 'topics', and 'modes'.  Any simple mathematical
         expression involving those variables is permitted.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         # XXX I could do this the right way, and abstract out a safe eval,
         #     or I could just copy/paste from the Math plugin.
         if self._calc_match_forbidden_chars.match(expr):
@@ -352,6 +358,9 @@ class ChannelStats(callbacks.Plugin):
         Returns the statistics for <channel>.  <channel> is only necessary if
         the message isn't sent on the channel itself.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         try:
             stats = self.db.getChannelStats(channel)
             curUsers = len(irc.state.channels[channel].users)
diff --git a/plugins/Math/plugin.py b/plugins/Math/plugin.py
index 3e648d8ac..4491d943e 100644
--- a/plugins/Math/plugin.py
+++ b/plugins/Math/plugin.py
@@ -197,7 +197,7 @@ class Math(callbacks.Plugin):
                 # use of str() on large numbers loses information:
                 # str(float(33333333333333)) => '3.33333333333e+13'
                 # float('3.33333333333e+13') => 33333333333300.0
-                return '%f' % x
+                return '%.16f' % x
             return str(x)
         text = self._mathRe.sub(handleMatch, text)
         try:
diff --git a/plugins/Seen/plugin.py b/plugins/Seen/plugin.py
index 58ff91583..3fc0c5eab 100644
--- a/plugins/Seen/plugin.py
+++ b/plugins/Seen/plugin.py
@@ -221,6 +221,9 @@ class Seen(callbacks.Plugin):
         saying. <channel> is only necessary if the message isn't sent on the
         channel itself. <nick> may contain * as a wildcard.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         self._seen(irc, channel, name)
     seen = wrap(seen, ['channel', 'something'])
 
@@ -235,6 +238,9 @@ class Seen(callbacks.Plugin):
         and returns the last time user was active in <channel>.  <channel> is
         only necessary if the message isn't sent on the channel itself.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         if name and optlist:
             raise callbacks.ArgumentError
         elif name:
@@ -269,6 +275,9 @@ class Seen(callbacks.Plugin):
         Returns the last thing said in <channel>.  <channel> is only necessary
         if the message isn't sent in the channel itself.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         self._last(irc, channel)
     last = wrap(last, ['channel'])
 
@@ -295,6 +304,9 @@ class Seen(callbacks.Plugin):
         <channel> is only necessary if the message isn't sent in the channel
         itself.
         """
+        if msg.nick not in irc.state.channels[channel].users:
+            irc.error(format('You must be in %s to use this command.', channel))
+            return
         self._user(irc, channel, user)
     user = wrap(user, ['channel', 'otherUser'])
 
@@ -313,6 +325,8 @@ class Seen(callbacks.Plugin):
             irc.error(format(_('%s must be in %s to use this command.'),
                 ('You' if nick == msg.nick else nick), channel))
             return
+        if nick is None:
+            nick = msg.nick
         end = None # By default, up until the most recent message.
         for (i, m) in utils.seq.renumerate(irc.state.history):
             if end is None and m.command == 'JOIN' and \
diff --git a/src/utils/net.py b/src/utils/net.py
index 544371acd..289a2fe28 100644
--- a/src/utils/net.py
+++ b/src/utils/net.py
@@ -114,7 +114,7 @@ def isIPV4(s):
     0
     """
     try:
-        return bool(socket.inet_aton(s))
+        return bool(socket.inet_aton(str(s)))
     except socket.error:
         return False