First off, lemme say I'm a huge fan of ImgBurn, used it since v1.2 when I first became aware of it, I swear by it and recommend it to others without hesitation.
That being said, I recently updated to ImgBurn 2.2. I've used 2.1 to successfully backup 30+ 360 games on Verb DVD+R DL media with no probs. The L0 is set correctly to 1913760, my 360 is modded, and CMC Mag is a profanity in my house, never comes near my burner or 360, I only use Taiyo Yuden's for DVD-5 media and Verb DVD+R DL for DVD-9 media. I tried to backup two Dual Layer discs of late, one for PS2 and one for Xbox 360. The layer break was set to auto for PS2 (which always worked in the past for PS2), and 1913760 for my Xbox 360 backup. The PS2 backup booted, but lagged horribly on Verb's, and would lock up at load screens. I reburned it with DVD Decrypter and it worked fine. My Xbox 360 backup wouldn't boot at all, just gave me disc read errors. I reburned it with ImgBurn 2.1, worked perfectly. I have a Liteon 16W1P with the current firmware (none available at present, just stock fw). My burner is in DMA, I have 300+ PS2 backups, 200+ Xbox 1 backups, and 40+ 360 backups, so I'm not new or anything. I burn my DVD-9 backups at 4x on 8x discs, and never had probs with ImgBurn 2.1, CloneCD, or Xbox Backup Creator. I have one other confirmed report of this, a friend of mine backed up a 360 game that he has made several successful copies of with ImgBurn 2.1 and CloneCD. He burned it at 4x with ImgBurn 2.2, and got Disc Read Errors on his modded 360. After two DL coasters, I uninstalled 2.2 and went back to 2.1.
Obviously this hasn't been replicated enough to confirm any kind of bug report. My instincts just tell me it's something that changed in the ImgBurn 2.2 update concerning DL write strategies. Due to the high cost of DL media, I'm not willing to do any kind of in-depth experimentation and see if I can find the source of the problem, or even that the recent ImgBurn update is the cause. I just wanted to put a word of warning out to anyone who uses ImgBurn 2.2 to backup DL media, particularly on Xbox 360 or other consoles, and give the creators some feedback. Thanks for any input from Lightning UK. As someone who's active in the console modding community, we owe you guys a huge debt; ImgBurn/DVD Decrypter are the holy grail of console backups, keep up the great work!