i ran into the same situation. When you connect the BB to your computer to sync or backup, it will change the photo to a pic on the internal memory. Don't know why it won't keep the same background. The only workaround I know of is to load the pic you want into the internal device memory from the SD card.
If you do a battery pull, it will show the pic you chose located on the card...but will revert back as soon as you connect to the computer.
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