Forum:Glitch Leveling Up (360), is my game ruined?

I am leveling up to level 18 playing Fallout 3 on the 360 and when I do this it will not allow me to choose a perk! Is this a known glitch? Is my game ruined? Sucks, I spent HOURS on this and now it won't advance past this. On every perk "Done X)" is grayed out. Can't advance past this point.  Is there any way to fix this or around this?  Thanks.