added is_really_writable() to Common.php, replaced is_writable() throughout application with is_really_writable()
diff --git a/system/libraries/Upload.php b/system/libraries/Upload.php
index 39f1ed5..dd70122 100644
--- a/system/libraries/Upload.php
+++ b/system/libraries/Upload.php
@@ -641,7 +641,7 @@
 			return FALSE;

 		}

 

-		if ( ! is_writable($this->upload_path))

+		if ( ! is_really_writable($this->upload_path))

 		{

 			$this->set_error('upload_not_writable');

 			return FALSE;