While doing sundial activity in the bombardment section a barrier colossus put up its barrier. When it moved off it had left a crate sized bubble of barrier permanently active where it had been standing. We couldn't shoot through or around the barrier and it became an issue when enemies were too close to it because they became protected. When we completed the bombardment and went back through the area to kill the psion flayer the bubble was still there in its spot. I don't have YouTube video but I do have multiple video captures through xbox if there is a way to upload them.