Once the thumb image appeared clicking on the View button or double clicking on the thumb image will display the picture:

The Picture size control allows you to size the image before it is displayed. The maximum (100%) is full screen size (at least the width or the height is the maximum and the other dimension is set to keep the proportions). The minimum is 25% of the screen size.
The time of displaying the picture depends on the picture and on the connection speed of your and your partner's computer. Please be patient, it may takes a few seconds. The status of the data transfer is displayed. When data transfer is finished the picture is displayed automatically. In rear cases the window appears with blue background without the image. When this happens, close the window and click again on the thumb image. Remote Picture Viewer transfers data only once. Any second access to the data (view, print, download) will be immediate. The temporarily data will be cleared every time when Remote Picture Viewer loads into memory.