If I am not mistaken, the cause of the problems with NERO burning mpc comes from the fact that the mpc plugin is more of a patchwork solution, rather than an actual plugin that conforms to the SDK. High/Low priorites just acted as a quick fix for some. For me, the fix worked about 1/10 times, which is terrible at best. I would HIGHLY suggest you try Burrrn. You can get it
here. True drag and drop interface and it reads APE tags perfectly.