Problems with image uploader in IE but not in Firefox

Hi

I’ve noticed on a couple of client sites that they are having ‘occasional’ problems with the media uploader. However, it seems to be only when they are using IE as their default browser and not when using Firefox. When I came across this problem with a client again today I came home and tried to replicate it on my own site – same problem, couldn’t use it in IE, but it worked in Firefox. Do anyone have any ideas about what could be causing these issues at all please? I had a look at the post about uploader issues but it doesn’t seem to have this one listed and I’ve tried everything suggested before. Even going so far as to reinstall whole sites (correctly).

Thanks in anticipation

Linda