I had a different but similar issue.
I used GQ brand of DVDs successfully for about 2 months. I didn't realize the Brand was such a Deal.
However -- they all still read on my Vaio Pc (which has a Sony rebadged Liteon dvd writer) and two other DVD Players that are quite old. But the Liteon 5005 will not accept this brand of dvd -- blank OR recorded -- any longer. I do not know if it is interaction with discs from the Pc or using some HPs they both happened around the same time. Unfortunately I have several great DVDs that I didn't finalize and can't be read anywhere.
It is hard to understand why this same package of disks would start failing in the middle and it also cannot read the ones it recorded and yet I can read them on other players and my PC. Since there is Memory on the writer I assume something environemental changed?
After research I updated using the two zip files on Liteon web site 1098/1000.
This made no difference however was very simple.
HELP anyone with any Real Knowledge of this? Weird. It is amazing how nonstandard all this dvd and optical stuff IS.