Oh man what a pain. I couldn't sort it out so did the site from scratch.
NOW I have a different problem. My host moved to a different server at the weekend and since then my own zen cart site has been down - BLANK SCREEN AGAIN! I can't even access the error log - this is the message [a fatal error or timeout occurred while processing this directive]

I have told my host providers who are looking at it but in them meantime my site has been down all week

AND I'VE JUST DISCOVERED THE ADMIN PAGE HAS A LIST OF ERRORS LIKE THIS:
Deprecated: Function ereg() is deprecated in /home/relaxing/public_html/includes/classes/db/mysql/query_factory.php on line 177

PLEASE SOMEONE HELP !!!!