I have installed a theme and started to change the content.
I added some links by going to content area and editing the page.
In the same area I have tried to add Media. This is within the body and clicking on the Insert/Update Media
If I add a image there is no problem and it displays within the body
However if I go to the Browse Media and open the folder with the pdf files. When I try to upload a file another browser window opens and in the URL about:blank is displayed.