My xp bar and possible my total XP is completely broken on my main character. I cannot level up.
My friend has this problem too after we beat the game and began playthrough 2.
On the second day of release, another one of my friends had it happen to him on level 6 while I was with him and when he restarted borderlands, he was level 3 and lost most of what he gained since 6.
This if loving ridiculous now. They better fix this immediately.
On top of that, claptrap always gets stuck on Flynt's elevator before you fight him. It's happened to me on my last 3 characters and it takes like 10 minutes for him to get unstuck usually