When viewing attachments, we are able to easily print documents, but image files only open in the preview without a clearly defined means of printing. In IE, right-click and print produces a blank page, Firefox does not even provide this option. Current workaround is to save image(s) to disk and then print.
Good observation. We are currently working on a new version of GT. I will bring this up to our development team and will see what we can come up with.