I have the same problem...the only difference is I have been burning using ImgBurn for about a month (30 successfuls DVD's), then I went to record a DVD yesterday and received the same message on start up of the app??? I have tried six different types of blank DVD's, uninstalling and reinstalling the DVD Recorder and nothing seems to work. The DVD drive still works fine for playback of disc's I have burnt.
I have a LG Burner also.