Hi LIGHTNING UK!, I love your program and think I have finally figured it out. I thought maybe it was your program since it was playable with TMT5 before and after burning with ImgBurn it wasn't but after some experimenting I found it was caused by the folder index.bdmv. I remembered in the old days we had to run it thru Avchd-Patcher to make the disk an AVCHD. I dug up the program and after using it the disks I have reburned have all been correctly identified as AVCHD and play back oin all my players. Before patching the DVD+R DL BD9's the only player that was playing them at all was my Oppo93. Thanks for your assistance, it seems the real problem lies somewhere in BD_Rebuilder's processing of the index.bdmv files. thanks for the great program!!