Index: trunk/core/kernel/session/session.php
===================================================================
diff -u -r2835 -r2841
--- trunk/core/kernel/session/session.php	(.../session.php)	(revision 2835)
+++ trunk/core/kernel/session/session.php	(.../session.php)	(revision 2841)
@@ -327,8 +327,40 @@
 		return preg_match($reg, getArrayValue($_SERVER, 'HTTP_REFERER') ) || (defined('IS_POPUP') && IS_POPUP);
 	}
 
+	function CheckDuplicateCookies()
+	{
+		if (isset($_SERVER['HTTP_COOKIE'])) {
+			$cookie_str = $_SERVER['HTTP_COOKIE'];
+			$cookies = explode('; ', $cookie_str);
+			$all_cookies = array();
+			foreach ($cookies as $cookie) {
+				list($name, $value) = explode('=', $cookie);
+				if (isset($all_cookies[$name])) {
+					//double cookie name!!!
+					$this->RemoveCookie($name);
+				}
+				else $all_cookies[$name] = $value;
+			}
+		}
+	}
+
+	function RemoveCookie($name)
+	{
+		$path = $_SERVER['PHP_SELF'];
+		$path_parts = explode('/', $path);
+		$cur_path = '';
+		setcookie($name, false, null, $cur_path);
+		foreach ($path_parts as $part) {
+			$cur_path .= $part;
+			setcookie($name, false, null, $cur_path);
+			$cur_path .= '/';
+			setcookie($name, false, null, $cur_path);
+		}
+	}
+
 	function CheckIfCookiesAreOn()
 	{
+		$this->CheckDuplicateCookies();
 		if ($this->Mode == smGET_ONLY || (defined('INPORTAL_ENV')&&INPORTAL_ENV && defined('ADMIN')&&ADMIN && !$this->Application->GetVar('front')) )
 		{
 			//we don't need to bother checking if we would not use it