Not sure I understand your comment. Can you elaborate further? Is it always after you've added 'x' number of jpegs or does these bars appear on certain jpegs? Are the slide images effected in any way. I.e. do they look wrong when you preview the slideshow in the PhotoVidShow editor or when creating a video? Etc.
The problem is that after loading some jpeg images into PhotoVidShow, the images in the slides in the storyboard panel appear half normal and half grey (grey in the bottom half of the slide). This is because the system is not fully loading the images when requested. It is not clear why this is happening except perhaps the images are being imported from a different location rather than the local computer hard-drive. e.g. If the images are located across the network on another device, or perhaps stored on an external USB disk this type of problem may occur.
When importing video or images into PhotoVidShow, because PhotoVidShow will constantly need to read these files, ALWAYS have them located on your local hard-drive.
Robert has not confirmed if this was his problem or not.