I have a Sony DRU-710A before anyone asks and have never had this problem before.

Recently I had some +R's and they've burned flawlessly. Prior to that, I was pretty much -R regularly once in a while a coaster, but thats bound to happen occasionally. Never had +R's before really.

NOW to today...

So I burned a few using my last of the +R's. No problem, flawless burns.

I have two spindles of -R, both different brands (Sony and Memorex) and went to burn. Neither brand will burn and Ive used both brands and speeds before.

Other than trying other discs, is there any other way to troubleshoot this? Is the +R's the reason this has happened?