If the RAR or ZIP images fail to read it is likely they are too many pixels. I have found approximately 4 Mpixel images are the biggest it will digest successfully. (2k x 2k) approx.
Try just using some images you might have lying around and see what it does. You may also want to try IrfanView for the pc. It is a free download and can resize a batch of images to a smaller size. It does a very good job. The image size for the device is only 800x600 with about 760 really visible. Anything larger will get resized down to that level.
Dale
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