I have been told by my customers that the "Archive Manager", which is very good and extremely useful for them, works in FF but does not display the Expanded mode in IE and Opera browsers.
I think this is because there is, not so much a bug but a typo in one of the templates - listarchives.tpl.
If the line containing "<style" which is spurious is removed (it's somewhere in the first 10 lines) this module displays fine in all browsers.