If I click on the tabs, nothing seems to happen. After choosing a file, the filename will be displayed next to the Browse-button and nothing happends. In the "File & Images" section the form looks the same.
Did you figure this out? We are having a similar problem. We installed DataObjectManager and Uploadify and ever since then, when we try to upload files (even from the standard Files & Images tab in the admin mode, we can select a file exactly like you but then nothing happens and no files get uploaded.