My DInc is unrooted as well. Shortly after I got my phone (12/10) I started using Solar Winds Live Pro as my wallpaper. I remember that if I did a reboot, SWLP would remain as my wallpaper. About 6 months ago I did a software update (frankly I can't remember if it was to SWLP or to the firmware) and from that point forward whenever I did a reboot the wallpaper would revert to the base HTC fixed-image wallpaper. I then have to manually switch the wallpaper back to SWLP, which is no big deal because it remembered my particular settings.