Sorry for the delay but finally back to helping my friend out. Having looked closely at the VP burning to Blu-ray, I had been using the export to Blu-ray function inbuilt in video pad. This gave the not playing error. Then I installed the stand alone express burn part of the suite and this burned and played Blu-ray discs fine. Why one burner works and the other doesn't I can not explain. Only one thing I can't make work is using this same burner but with dvd's results in very poor quality playback but maybe there might be some settings to change although with restricted access time there was nothing immediately obvious.