The compatibility list shows that my player can play -R and +R.

Ok I burnt a DVD+R and -R the same way, BUT on two different medias, the +R was the media that came with my liteon ldw 411s, the -R was sony.
I ripped with DVD shrink 3, and burnt with Nero 6.
I Know that the sony burnt at 2x and has a write strategy of 1x. Which is said to cause errors. I cant select to burn at 1x. I burnt another movie the same way I did the working +R onto another sony and that doesnt work either.
Is it my player that cant play -R or the bad media? I want to order 4x Ritek G04's but now I dont know if they will work on the AD-1500.

Thanks Guys!!