diff --git a/src/js/chat.js b/src/js/chat.js
index 7d1e7f7..4b6881a 100644
--- a/src/js/chat.js
+++ b/src/js/chat.js
@@ -34,8 +34,12 @@ export default class Chat {
     }
 
     if (options && options.error) {
-      $el = $('<li class="log-error">').addClass('log').html(message);
-    } else if (options && options.info) {
+      $el = $('<li class="log-error">').addClass('log').html('ERROR: ' + message);
+    } else if (options && options.warning)  {
+      $el = $('<li class="log-warning">').addClass('log').html('WARNING: ' + message);
+    } else if (options && options.notice) {
+      $el = $('<li class="log-info">').addClass('log').html('NOTICE: ' + message);
+    }  else if (options && options.info) {
       $el = $('<li class="log-info">').addClass('log').html(message);
     } else {
       $el = $('<li>').addClass('log').html(message);
@@ -68,9 +72,10 @@ export default class Chat {
     const COLORS = [
       '#e21400', '#ffe400', '#ff8f00',
       '#58dc00', '#dd9cff', '#4ae8c4',
-      '#3b88eb', '#f47777', '#d300e7',
-      '#99FF33', '#99CC33', '#999933',
-      '#996633', '#993333', '#990033',
+      '#3b88eb', '#f47777', '#EEACB7',
+      '#D3FF3E', '#99CC33', '#999933',
+      '#996633', '#B8D5B8', '#7FFF38',
+      '#FADBBC', '#FAE2B7', '#EBE8AF',
     ];
     // Compute hash code
     let hash = 7;
@@ -173,7 +178,7 @@ export default class Chat {
           return this.log('Username must start with a letter.', {error: true});
         }
 
-        this.darkwire.updateUsername(window.username, newUsername).then((socketData) => {
+        this.darkwire.updateUsername(newUsername).then((socketData) => {
           let modifiedSocketData = {
             username: window.username,
             newUsername: socketData.username
@@ -181,6 +186,8 @@ export default class Chat {
 
           this.socket.emit('update user', modifiedSocketData);
           window.username = username = socketData.username;
+        }).catch((err) => {
+          return this.log(err, {error: true});
         });
       }
     }, {
@@ -194,7 +201,7 @@ export default class Chat {
           return '/' + command;
         });
 
-        this.log('Valid commands: ' + validCommands.sort().join(', '), {info: true});
+        this.log('Valid commands: ' + validCommands.sort().join(', '), {notice: true});
       }
     }, {
       command: 'me',
diff --git a/src/js/darkwire.js b/src/js/darkwire.js
index e344391..6daec6e 100644
--- a/src/js/darkwire.js
+++ b/src/js/darkwire.js
@@ -53,16 +53,12 @@ export default class Darkwire {
     return _.findWhere(this._users, {id: id});
   }
 
-  getUserByName(username) {
-    return _.findWhere(this._users, {username: username});
-  }
-
   updateUser(data) {
     return new Promise((resolve, reject) => {
       let user = this.getUserById(data.id);
 
       if (!user) {
-        return reject();
+        return reject('User cannot be found');
       }
 
       let oldUsername = user.username;
@@ -105,45 +101,62 @@ export default class Darkwire {
     return importKeysPromises;
   }
 
+  checkSessionUsernames(username) {
+    let matches = _.find(this._users, (users) => {
+      return username.toLowerCase() === users.username.toLowerCase();
+    });
+
+    if (matches && matches.username) {
+      return matches;
+    }
+
+    return false;
+  }
+
   removeUser(data) {
     this._users = _.without(this._users, _.findWhere(this._users, {id: data.id}));
     return this._users;
   }
 
-  updateUsername(username, newUsername) {
+  updateUsername(username) {
     let user = null;
 
     return new Promise((resolve, reject) => {
-      if (newUsername) {
-        user = this.getUserByName(username);
+      if (username) {
+        user = this.getUserById(this._myUserId);
       }
 
-      if (username) {
-        if (!user) {
-          Promise.all([
-            this._cryptoUtil.createPrimaryKeys()
-          ])
-          .then((data) => {
-            this._keys = {
-              public: data[0].publicKey,
-              private: data[0].privateKey
-            };
-            return Promise.all([
-              this._cryptoUtil.exportKey(data[0].publicKey, 'spki')
-            ]);
-          })
-          .then((exportedKeys) => {
-            resolve({
-              username: username,
-              publicKey: exportedKeys[0]
-            });
-          });
-        } else {
+      if (!user) {
+        Promise.all([
+          this._cryptoUtil.createPrimaryKeys()
+        ])
+        .then((data) => {
+          this._keys = {
+            public: data[0].publicKey,
+            private: data[0].privateKey
+          };
+          return Promise.all([
+            this._cryptoUtil.exportKey(data[0].publicKey, 'spki')
+          ]);
+        })
+        .then((exportedKeys) => {
           resolve({
-            username: newUsername,
-            publicKey: user.publicKey
+            username: username,
+            publicKey: exportedKeys[0]
           });
+        });
+      } else {
+        let userExists = this.checkSessionUsernames(username);
+        if (userExists) {
+          if (userExists.id !== this._myUserId) {
+            return reject(username + ' is being used by someone else in this chat session.');
+          }
         }
+
+        return resolve({
+          username: username,
+          publicKey: user.publicKey
+        });
       }
     });
   }
diff --git a/src/js/main.js b/src/js/main.js
index 9c4ff0b..a5738b3 100644
--- a/src/js/main.js
+++ b/src/js/main.js
@@ -48,7 +48,7 @@ $(function() {
       fs(window.TEMPORARY,
         100,
         () => {
-          chat.log('WARNING: Your browser is not in incognito mode!', {error: true});
+          chat.log('Your browser is not in incognito mode!', {warning: true});
         });
     }
     chat.log(moment().format('MMMM Do YYYY, h:mm:ss a'), {info: true});
diff --git a/src/public/style.css b/src/public/style.css
index 606e38b..de53408 100644
--- a/src/public/style.css
+++ b/src/public/style.css
@@ -313,14 +313,20 @@ html.no-touchevents .chat #input-icons {
   line-height: 10px;
 }
 
-.log-info {
-  color: #FFF;
+.log-error, .log-info, .log-warning {
   font-weight: bold;
 }
 
 .log-error {
-  color: yellow;
-  font-weight: bold;
+  color: #D8D638;
+}
+
+.log-info {
+  color: #FFF;
+}
+
+.log-warning {
+  color: #E0873E;
 }
 
 .action {