[post branched from older thread]
It appears this problem can still occur as of 11-17-2016. However, the means to correct it appears to be gone. I can find no fields labeled "nickname" in my profile page. The helpline folks haven't even heard of this feature, it's obviously been long deprecated. Any idea how to remove the nickname now that the field is no longer accessible? I've been through many reps on the helpline and up to level 3 techs...still no solution.