I have posted several articles in the past, however the last 2 days when i go to post my unique articles it says it is not unique and has been posted before. (I just finished writing this one 5 min ago) any idea on why it would be doing this?
In which site? Check once your title because generally at submission time article directories check title for duplicate ..... and after review got message like you are saying "Duplicate". If site is saying that its duplicate then check first at your end that what you are missing.