diff --git a/bl-kernel/abstract/plugin.class.php b/bl-kernel/abstract/plugin.class.php
index 3ebd4f44..13acf26c 100644
--- a/bl-kernel/abstract/plugin.class.php
+++ b/bl-kernel/abstract/plugin.class.php
@@ -170,6 +170,13 @@ class Plugin {
 		return $this->className;
 	}
 
+	public function isCompatible()
+	{
+		$explode = explode(',', $this->getMetadata('compatible'));
+
+		return in_array(BLUDIT_VERSION, $explode);
+	}
+
 	public function directoryName()
 	{
 		return $this->directoryName;
diff --git a/bl-kernel/admin/themes/default/css/default.css b/bl-kernel/admin/themes/default/css/default.css
index 92f4e913..d65fc9c8 100644
--- a/bl-kernel/admin/themes/default/css/default.css
+++ b/bl-kernel/admin/themes/default/css/default.css
@@ -282,14 +282,14 @@ table.statistics tr:last-child td {
 /* ----------- ALERT ----------- */
 
 #alert {
+	bottom: 0;
 	color: #ffffff;
-	display: none;
 	padding: 10px;
+	display: none;
 	position: fixed;
 	text-align: center;
-	top: 0;
-	width: 100%;
 	z-index: 100;
+	right: 0;
 }
 
 .alert-ok {
diff --git a/bl-kernel/boot/init.php b/bl-kernel/boot/init.php
index e1082157..9c1f9cb2 100644
--- a/bl-kernel/boot/init.php
+++ b/bl-kernel/boot/init.php
@@ -1,7 +1,7 @@
 <?php defined('BLUDIT') or die('Bludit CMS.');
 
 // Bludit version
-define('BLUDIT_VERSION',	'Github-Version');
+define('BLUDIT_VERSION',	'1.3');
 define('BLUDIT_CODENAME',	'');
 define('BLUDIT_RELEASE_DATE',	'');
 define('BLUDIT_BUILD',		'');
@@ -115,7 +115,7 @@ define('TOKEN_EMAIL_TTL', '+15 minutes');
 define('CHARSET', 'UTF-8');
 
 // EXTREME FRIENDLY URL, TRUE for dissmiss internet standard
-define('EXTREME_FRIENDLY_URL', true);
+define('EXTREME_FRIENDLY_URL', false);
 
 // Directory permissions
 define('DIR_PERMISSIONS', 0755);
diff --git a/bl-kernel/boot/rules/60.plugins.php b/bl-kernel/boot/rules/60.plugins.php
index 0e26b89a..13b05c2a 100644
--- a/bl-kernel/boot/rules/60.plugins.php
+++ b/bl-kernel/boot/rules/60.plugins.php
@@ -96,16 +96,20 @@ function buildPlugins()
 			$Language->add($database);
 		}
 
-		// Push Plugin to array all plugins installed and not installed.
-		$plugins['all'][$pluginClass] = $Plugin;
+		// If the plugin is compatible with the Bludit version, add to arrays
+		if($Plugin->isCompatible()) {
 
-		// If the plugin is installed, order by hooks.
-		if($Plugin->installed())
-		{
-			foreach($pluginsEvents as $event=>$value)
-			{
-				if(method_exists($Plugin, $event)) {
-					array_push($plugins[$event], $Plugin);
+			// Push Plugin to array all plugins installed and not installed.
+			$plugins['all'][$pluginClass] = $Plugin;
+
+			// If the plugin is installed, order by hooks.
+			if($Plugin->installed()) {
+
+				foreach($pluginsEvents as $event=>$value) {
+
+					if(method_exists($Plugin, $event)) {
+						array_push($plugins[$event], $Plugin);
+					}
 				}
 			}
 		}
diff --git a/bl-kernel/boot/rules/99.themes.php b/bl-kernel/boot/rules/99.themes.php
index c4931ce2..3b3b386c 100644
--- a/bl-kernel/boot/rules/99.themes.php
+++ b/bl-kernel/boot/rules/99.themes.php
@@ -48,9 +48,20 @@ function buildThemes()
 					break;
 				}
 
-				$database = $database + $metadata;
+				// Check if the theme is compatible
+				if(empty($metadata['compatible'])) {
+					Log::set('99.themes.php'.LOG_SEP.'Metadata error, field compatible invalid '.$themePath);
+					break;
+				}
+
+				$explode = explode(',', $metadata['compatible']);
+				if(!in_array(BLUDIT_VERSION, $explode)) {
+					Log::set('99.themes.php'.LOG_SEP.'Theme incompatible '.$themePath);
+					break;
+				}
 
 				// Theme data
+				$database = $database + $metadata;
 				array_push($themes, $database);
 			}
 		}
@@ -81,4 +92,4 @@ if( Sanitize::pathFile($languageFilename) )
 	if(!empty($database)) {
 		$Language->add($database);
 	}
-}
+}
\ No newline at end of file