Hi,
I tried to upload an image with the account that I created on your website.
Now we can see that the upload library is loaded correctly. Previously the input field for the upload was not hidden.
I upload an image using drag & drop (tested with "Google Chrome" and "Mozilla Firefox") and it works good.
Which file did you upload ?
Note: The upload by drag & drop does not work with old version of Internet Explorer.
It works fine with Internet Explorer 10 but with the the version 6,7,8,9 it doesn't.
The "file drag & drop" is a HTML5 feature which has been introduce is recent browser. When IE9 came, the specifications where too young for microsoft so it wasn't implemented.
But even if the drag & drop does not work, it is possible to upload with old version of IE (using the upload icon).
Regards,