Final Update:
OK, i tried everything I knew and lotsof things I didn't know. Read lots on forum and still couldn't make it work. There were one or other errors popping up which i couldn't understand so i decided to back up critical files (default_language.php, comprofiler.class.php, ue_config.php) reinstalled CB and reloaded critical files and now everything is fixed. I lost no data and all changes took affect when I uploaded the files again. Job done. Should have done it ages ago!