Hi there, when you turn the full-screen on (that's when we also load high-res images when they are available), any further zooming is not yet possible due to various browser differences in the way they handle the full-screen mode on Mac and Windows.
The ability to add the toolbar controls in the full-screen mode is coming with the new 3.5 build which will be available in about a week. If you email us at support at webrotate360 dot com, we will let you know when the new release is available.