[pawel]

AAR.oner, if a DVD has menu and chapters it doesn't mean it is professionally authored. I'm not sure which (old) programs write incorrectly *.ifo/bup files but these created in Architect, DVD Studio Pro, DLP, Maestro, TDA are always correct. Other tools are just for fun, and not professional authoring. Adobe Encore could be a pro tool but it's full of bugs and re-encodes some streams without any user control, so it's a crap.