CKFinder only works in Internet Explorer (IE)

I've had no further luck with this so looks like I'll downgrade to FCKEditor to see if that resolves the problem.

Upon further investigation, it appears as though the "Upload" tab and the "Browse Server" button are there in the HTML but in the inline CSS the display is set to none. When I amend the CSS to display the elements, they don't work when clicked so it must be more than not being visible, they can't be activated.

The fustration is that it works fine in Internet Explorer. My client has a Mac and uses Firefox and I use Vista on the PC and use both IE and FF.

This is puzzling.

Just to add, the only difference I can see in the source between my installation and the online demo is that display is set to none for the "Browse Server" button and the "Upload" tab within the inline CSS.

What would cause that to happen?