Same here, I have tried Bulkpaq DVD-R Gen 4 (the Green one) on my Pioneer A05 with very bad results, in fact, havnt managed to burn anything so far with these discs

Tried Datasafe 4x (Grey top) and they work fine, 10 good burns so far and all work in the Home DVD Player as well, no trouble.
Try to burn with another disc and recomend Stomp Recordnow Max 4.5, good results with this combination
