I finally got around to putting a new picture as the home screen image on my new BlackBerry Curve. The problem - every time I synchronized against the BlackBerry Desktop Manager software, my home screen image would get reset to the default for the theme. I’d go set it again, sync up, and watch my wallpaper disappear. The image file was still there, it just wasn’t my wallpaper anymore.

The answer: Store any picture you want as your home screen image on the device memory, not on a media card. If you store the image on the media card, it’ll get reset when you sync. If you store it on the device memory, it’s stays persistent the way you’d expect.