Temple of Varn, Water Temple. The Defenders and Sentinels and such in the little stairway leading down to the chest cannot get out of there - they get stuck on each other. I've tried and retried probably 40 times and can't get them to come up. They just do that little fast back and forth thingie and stay there. I've set a beacon right next to them but them really don't move at all around that first corner.
As I said, open to suggestions.
Everything else has been very easy so far for the most part.