server files getting crupted when updating to the latest shapshot

I updated to the latest snapshot and updated my survival serve to the latest snapshot and loggen in and it said I wasn't whitelisted so I whitelised my self and joied and my inventory was empty. my spawnpoint wasn't set. my enderchest data was gone to. all the old files where cruped exept for the world file. the players.dat the ops.txt and bans.tnt everthing was cruped. I had backups so its fine I recovered everthing , just wanted to tell mojang about this. thank you -Eric Golde