I looked at the log on PCSX2 when running the DUB and UNDUB versions. But I did not see anything different. That is an interesting thought about the UNDUB files being created for DVD5. The UNDUB DVD9 file was definitely made properly in other respects that I can't duplicate. Apache recognizes it as a true DVD9 iso whereas if I try to rebuild a DVD9 iso Apache tells me it is not a DVD9 iso.