One of my quizzes has been marked as new,even though it's been there for a couple of years,and taken off line for no apparent reason.
Should I resubmit it?

If you didn't get a correction note or any other note that could explain why your quiz is offline, yes, I think you should resubmit it. However, it might be wise to add a note to your quiz (by sending a correction note to your own quiz) explaining that you didn't take it offline and that you didn't change anything. Otherwise the editor that gets to your quiz will probably wonder what happened.

I have no idea why the quiz is marked as new all of a sudden. Do you know when it happened? Maybe it has something to do with the weekly update of the quiz rankings.

Problem resolved. It came off 'accidentally' when it was moved to a new subcategory. The grammar 'bot pulled it for a minor punctuation problem, which I have now fixed. The quiz is back online.

Thank you very much spanishliz.