I have recently upgraded my system to Snow Leopard and am finding that the DVD's I burn in DVD Studio Pro 4 and Toast are now not playing on some DVD players and PC's. I am burning them in toast for use on both Mac and PC and never had problems before on the system below snow leopard.
Is this a Quicktime issue? I know that Snow Leopard has a newer QT player that is not compatible with some older systems. I do not want to downgrade my system.