Thanks Justin. I have just tried it and it seems to have fixed the problem (until my client tells me otherwise of course!)
Is this a change I need to make in every installation?
Thanks for your reply.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.