I changed my (offline) gamertag from sam to samiles.

Now, in Halo 3, when I load up Halo, instead of saying "Resume Campaign" it says "Start Solo Campaign". In other words all my game progress is gone.

However, when I look at the xbox dashboard, I still have all my halo achievements (including clearing 5 levels.)

Where has my game gone??!!

Please help,

Thanks,

Sam