I can verify this happened to me too. Also when it happened Avatar of Sin was not visible in the cutscene. Had to reset it and run it over again. We tried to warp to rally but the door was still closed.
This has also happened to me on USPS3. We enter the room and the cutscene begins but the Avatar of Sin doesn't appear in the cutscene. Then he gets trapped in the door and cannot be targeted or damage. We can't do anything but disband the instance and try again. My group queued this up 3 times and the same thing happened 3 times in a row before we just gave up.https://forums.station.sony.com/dcuo/index.php?threads/trigon-alert-avatar-of-sin-bug.170509/
