Thanks for your help fglock. As it happened I had started to change persistent data to forms and this resolved the issue. You're way would have been a lot easier!

Still pretty pissed that I don't have any further idea of why the cache server (assuming it was the culprit) was caching CGI scripts ... seems bizarre in the extreme.

Also, would love to find one-stop-doc on caching outlining concepts and realities. Some good sites around but v. high on verbiage.

Rgds & thnks again.