The error message was because you don't have an SD card, and the default location for storing saved images is on the SD card. If you don't save any images, then it doesn't matter that you get this error message. If you want to get rid of the error message, then change the saved image folder location to be in /mnt/ext1/pbiv-saved-images in the configuration. (I should make that the default)
When zooming, the images always keep the same aspect ratio (i.e. they are stretched the same in both directions). When the image is zoomed to fit inside the screen, then you will almost always see some margins on either the sides or on the top and bottom because the images are usually not the same shape as the screen. Try using the reader in landscape mode, or trying other zoom modes to see what you like best.
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