According to the Sitecore 7.2 content author cookbook (page 66):
In the Content pane, click Browse to open the Select Media dialog box. The Select Media dialog box opens and displays all the items from the Media Library that is available for the image field you have chosen.
However, on my system, there is a Media folder
showing the currently selected media item for the image. The problem is all the filter options, My Images, Recently Uploaded Images, even All Image Files, only show descendants of the currently selected item and itself. There doesn't seem to be a way to select a different folder or reset the Media folder, unless you close the Select Media window, Clear the image field and then click Browse. But Clearing the image field before Browse also resets the Tree view, making it more difficult to select siblings of the current image.
Considering my local instance (and a second vanilla install I set up for testing) behave differently than the documentation, is there a setting I'm missing?