Tdk 420n wont reconize dvd+r's

Im using anydvd with clonedvd2 and Ive tried various brands with my tdk 420n and when its time to insert a recordable disk it wont reconize it for some reason. This just recently started happening Ive had plenty of success in the past and Ive tried updating the firmware and just about everything else. Anyone have any suggestions?

only thing i can think of is that the brand of +R that is not recognised is not compatible with your tdk. try another ?