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In Internet Explorer 6.x/7.x:

1. From the Tools menu, choose Internet Options.
2. Click the Privacy tab.
3. Move the slider so that privacy is set to Medium High or lower.
4. Click OK.

If that still doesn’t work, clear your browser’s cache:

1. From the Tools menu, choose Internet tab.
2. Click Delete Files and click OK.
3. Click OK again.
4. Close all browser windows, not just this one.
5. Login again.