I have created a bug report for this issue: http://www.jivesoftware.com/issues/browse/CS-1524
I have also checked for this problem with IE7, and it is not an issue. Is upgrading to IE7 a possibility for you and your users?
IE7 and Firefox2 work fine. I've only seen the problem with IE6.
For external collaboration... There are still plenty of old browsers. And no way to force a customer to upgrade.
I'm still hoping for a fix
the link to the case is not working.. and this is still a problem. Am assuming Jive did not address this?