Hmm, to run dvd youd need:
DVD AutoLauncher
DVD Decoder Library
DVD Navigation Manager
DVD Region Manager
DVDRuntimeLib
Control Strip Extension
Apple Dvd Player app (duh?)
macsbug NOT installed
If you are missing any of these files, you need to reinstall (this is from a 9.0.4 system BTW)
If you have all these, and still no luck, try trashing the dvd prefs
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-See Yea!