My +R SL and DL are all set to ROM booktype and burns look the same as your ImgBrn info.
I use ImgBrn exclusively to burn.
I have read lots of posts over the years about folks who have had issues with
Nero 6 and 7. I have never used Nero to burn +DL, or set booktype. So I can't help too much here, except to rcmnd u use ImgBurn. Never had a coaster SL or DL . I do, however, manually pick the LB in ImgBrn. No good reason, I just do. Obviously ImgBrn will also set booktype 'automatically' once you tell it to for your type of burner.
Questions: Will your standalone play your store bought DVD's? has it been able to play any burned DVD's (SL or DL, booktype set to ROM or not)?
Can you play your burned copy on your PC?
What media did you use?
What was burn rate? BTW: I never burn DL media faster than 4x, I have had marginal issues with some standalone players.
according to videohelp:
http://www.videohelp.com/dvdplayers/...dvd-hd870/8213.
Regards, and keep us posted.