Make maps playable after you kill a boss.

I'm stuck in a boss arena with 50% of my map uncleared. I used my best waypoint. There is a door on the OTHER SIDE of the barrier to get in but none for me to get out. Please fix this.

I had this one! The solution is to never open portal unless you have to.

Basically after you kill boss if you can't exit the arena, logout, then you'll be back at the starting point. If you opened a portal after the boss kill, then the map is bricked, you need to start another.