I think I solved the problem. I changed the slider size from 920 x 346 to 920 x 344 and uploaded it to the slider. Then I went into the Builder and clicked on the update button. After that the other slides appeared without me having to upload them again. In other words, just reuploading the first slider caused the other sliders to reappear. I know it sounds weird but this is exactly what happened. Thanks for your help and thanks for creating Alyeska. I really do love working with this theme.