Ok I can download the files now with 3.1.4 however i still have the issue where IE 8 or 9 and firefox downloads the jpeg as a unknown file type with no extension.
If i go in and rename the files as to add a .jpeg extention they open fine but clients are confused by this.
If i instead right click the links and do a save as it will correctly associate with a jpeg and open fine but clients tend to just left click and download the images.
I do not have any of these problems with chrome meaning i can left click or right click download and it works either way.