I have found a way to manually synchronise screens. The trick is to download 2 images on each panel. So if the panels are L(eft) / M(iddle) / R(ight) and there are three images 1 /2 /3 that make up the panorama from Left to Right. In the first round download to completion image 1 to L, image 1 to M and Image 2 to R. When these are done double-click right on each screen to download image 2 to L, image 2 to M and image 3 to R. Once downloaded set the images as 2 to L, 1 to M and 2 to R. You will need someone's help for the next part. Simultaneously double click left button on panel 1 and right on panels 2 and 3. As the image changes it will start at the beginning of its cycle. The screens will be very closely synchronised.