I use Zimbra Open source 8.0.3, and have a zimbra issue as following need your help.

1. I create a html link as "<a href="" target=_new>zimbra machine</a> <br>"
2. I click the html to redirect to zimbra login page, and login it. Now the browser has two tab page.
3. Briefcase's "Upload file" button won't work
4. If I close the first tab page, the button works.

anyone has the same problem? please help me out .