So this happened to me and my friend, he was level 20 1st prestige and then his game crashed, when he got back on, he was level 17 and lost 30k xp, for me, simply my xp didnt count and i kept getting this:
Eventually got to like -37k xp, i restarted my game and i had lost all of it :/ kinda disappointing.
Intel Core i5 2500k @ 4.5GHz
8gb DDR3 G.Skill Sniper RAM
Asus EAH6950 2GB
2TB Seagate Barracuda
Windows 7 Ultimate 64-bit
Black Ops doesn't save stats locally and instead syncs the stats into Steam Cloud when you are closing the game or idle in the menu. They should make it sync more often otherwise things like this will happen.
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