I have a G2 rooted with the Desire Z HBOOT and clockworkmod recovery 126.96.36.199 and everything was working perfectly when randomly out of nowhere my backups no longer restored properly. It would either say md5 sum mismatch or it would restore and get stuck at HTC bootscreen. This happens with any rom i flash. I've tried wiping/factory reset/formatting sdcard/flashing older cwm/ and even removing and creating new md5 images. NOTHING works. This is important to me because I ususally flash back and forth between different roms and I like being able to back them up.