Glad you got it sorted. Been using DL for a while now. Only problem was when I tried some cheapo discs. If I use Verbatim DVD+DL no problems at all (In over a year). I choose the layer break in DVDA. Make sure there's a suitable chapter at around the 1 hr mark. A fade to black is the least noticable layer change.
FWIW...
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I have only used DVD+RDL because I read they are more compatable that -RDL (al thought not as compatable as DVD-R.
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Only had one person say they conldn't play all of the disk. Made a new one and all was OK.
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I have always used TDK media (tape, cassets, CD, DVD) but was running out of DVD+RDL and couldn't find any more TDK. So I got Memorex (I don't like Memorex on general principals - and bad 'luck' with thier products).
I can't get any of my burners to burn one - all Sony of verious versions, including a BD drive.
So, I bought some Sony DVD+RDL and they worked OK.
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Paul Masters