Take Furballi's advice and try to burn at 4X, I believe when Clonedvd is installed it's default is maximum, I wouldn't recommend that setting.
If you need help regarding how to check your DMA settings, please advise and we'll walk you through it.
Where did you try to play the burned DVD, in your stand alone player or your PC?
If it was on the stand alone, does your manual indicate it is capable of reading DVD+ media. If so, could be your stand alone doesn't like Verbatim. Once you find a media that plays well, stick with it.
If it was on your PC, then I suspect it may be media related. Verbatim is good media but it's possible your LG burner doesn't like that media. Read your LG manual and see what media it works best with, try one of those if Verbatim is not listed.