Index: branches/RC/core/kernel/utility/cache.php
===================================================================
diff -u -N -r10516 -r10566
--- branches/RC/core/kernel/utility/cache.php	(.../cache.php)	(revision 10516)
+++ branches/RC/core/kernel/utility/cache.php	(.../cache.php)	(revision 10566)
@@ -28,6 +28,11 @@
 			else {
 				$this->_storage = new CacheStorage();
 			}
+
+			if (!$this->_storage->isWorking()) {
+				// when one of above cache storages fails to initialize fallback to memory cache
+				$this->_storage = new CacheStorage();
+			}
 		}
 
 		/**
@@ -102,6 +107,16 @@
 	class CacheStorage extends Params {
 
 		/**
+		 * Determines, that cache storage is working fine
+		 *
+		 * @return bool
+		 */
+		function isWorking()
+		{
+			return true;
+		}
+
+		/**
 		 * Stores value to cache
 		 *
 		 * @param string $cache_name
@@ -154,6 +169,16 @@
 		}
 
 		/**
+		 * Determines, that cache storage is working fine
+		 *
+		 * @return bool
+		 */
+		function isWorking()
+		{
+			return $this->_handler->getVersion() !== false;
+		}
+
+		/**
 		 * Stores value to cache
 		 *
 		 * @param string $cache_name
@@ -208,6 +233,16 @@
 		}
 
 		/**
+		 * Determines, that cache storage is working fine
+		 *
+		 * @return bool
+		 */
+		function isWorking()
+		{
+			return false;
+		}
+
+		/**
 		 * Stores value to cache
 		 *
 		 * @param string $cache_name