Upgrade to Edu Clean 2.1.3 and the header logo image is missing

Hi,
Upgraded from WPMU 2.8.4 to WPMS 3.0.1.
Then upgrade the previous Edu Clean theme to the new one 2.1.3 but now the logo/header image is not displayed.

In fact it displays an "edublogs homepage" image.

I went to Edu-Clean Options. Then under Top Header CSS Settings, the image/logo url location was correctly displayed. For an unknown reason (i'm still a rookie) the image/logo is not displayed in the site.

I also tried to access the image directly pasting the url of the image in my browser and cannot see it.

Please help.

Thanks
Charles