Thinking about it I think I have tried +R on it at some point, but since I normally use -R I stick with them.
I have had to get a new DVD Writer for my PC as the previous one (Lite-on) always had problems with burning discs and couldn't reliably produce a decent disk. Great when you had given the in-laws a video of your daughter and all they can say is it won't play.
Anyway glad to know that you have found some discs that work. My advice would be to stick with that particular brand from now on as you know it will work. Its often worth paying a few pence more per disc if they work, not much good it they are just coasters