Sorry - It's when browsing server not the actual upload
Sorry for the delay, I was expecting to be notified when a reply was posted...
Ok it looks like I've explained this wrong, I've always uploaded Images using the Image Info's "Browse Server" button, this way I can make folders and keep things tidy, it when I click the Browse Server button on this page (SEE ATTACHED) the error I posted is appearing.
I've just tried and can upload an image using the upload tab in the Image Properties control box, that works fine, it's the Browse Server box that's causing me problems.
Thanks
Lee