Thanks for your answer
Are you using a 3rd party skin on your site? If so, which one?
- yes Economic-SteelBlue from bestdnnskins
Which pages does this pop up appear?
I- n all pages (inclusive desktop modules), but only when you're login as superuser. If you are a normal user does not appear.
All of Host/Admin when you are logged in as SuperUser?
Does this also occur if you log in as an Administrator?
-- I don't test this, I logged with the standard host log in, I supposed it is a admin account.
As a interesting data in the described situation, if you click in admin menu upload file, nothing happen.