Fuji DVD+R DL is manufactured by RICOH and the media code is RICOHJPND00. The quality of this media varies. I would suspect that your Fuji +R DL burn was bad thus the drive can't read it. The easiest way to check is by doing Read Transfer Rate Test with Plextools. If the graph is smooth than there shouldn't be a problem reading the disk. A complete test would be running QCheck PI/PO Sum1 and Sum8 test.
Many users agree that Verbatim 2.4x DVD+R DL (media ID: MKM001) is the safest dual layer media to use for now, and that's why many dual layer burners can overspeed MKM001, including PX-716A up to 6x.