Thread:NoWayThisUsernameIsAlreadyOwnedBySomeone/@comment-26561761-20160326050417/@comment-26143371-20160522154426

If it happens again, can you execute in your browser's web console (Firefox / Chrome) and post the result if it happens again. If you're using another browser there's probably something similar.

usually the current event's page, but sometimes past events when people are editing them too. Event pages might also be affected because they are pretty much the biggest pages on the wiki. Could be some sort of timing issue in that case too.