well i can safely say that something weird is going on for you, if it cant even open vob files..... And that something isnt due to the application itself. I mean vue4 is and have been rock solid for quite some time and thousands of pepople are using it without problems, you should be able to open vob files and obj files, even pz3 files. So no its not the application as wabe said, but something else going on, and yes v5I is obviously even better but i woudnt recomend you buying it if v4 cant even open vob files for you, reinstall and check your system, something else is seriously wrong for you.