While i was playing on Arena, I was doing a job of catching a Battlemage, I was on the floor where the Battlemage was at, then when I got attacked by Rogue, so i attacked and after a few hits the game froze up on me.....and after waiting a red empty box just came out of nowhere.
Has anyone experienced this?

I am having the same problem. However its with a frost wolf in the Fortress of Ice as I try to get the second staff piece. I've reloaded it several times with no luck :-/