Had some issue - our website was completely broken with a lot of fatal errors after we tryied to upgrade to .13.. How stupid we all sometimes are.. Thanks GOD, I realize, that while uploading all files and folders turned "caps off", i.e. cms_compiler.class.php instead of CMS_Compiler.class.php
So had to reupload all files normally, upgrade took only few moments and now seems everything is OK.. Uff
