Either burner?
Is the new one on a different cable?
There used to be problems burning when the source hard drive and burner where on the same cable. But I haven't seen that in a while, newer burners and software have resolved that.

Sometimes multiple burning software can cause issues too, try un-installing all, rebooting, then reinstalling your favorite or one that worked best in the past.

Can you see the data on the disc after burning? You should be able to see a difference in appearance on the burned side of the disc, starting at the inside.

That and software configurations is all I can think of now.