I see you posted in "compo.sr website" but mentioned "i have the 10rc8 vertion of composer and uses both IE and Chrome". So I think you're talking about your install, I'll move the issue. I'll make as can't reproduce for now, but if you can provide more details (as above) we'll of course look closer.
Also, does it work for you from compo.sr, just not your own site? A link to your own site would also help (you can make a 'private' reply if you like).
Does anything appear in the browser error console?
Are you running HTTPS in some way? If so, is it via the base URL being https://, or certain pages only being HTTPS?