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Here is a solution to your problem in case of dvd postured with more than one titles, it can be easily identified with some thing attach to it such as Part, Language Different etc.It seems to be key for that identification.

Yes I also agree to that in some case we definately require the check and uncheck facility.It will make the work quicker and easier.Otherwise it proved to be time consuming to get in to every topic and than checked one by one.

It is not possible if the system is perfectly working,you must check it out something is wrong with the system and check the buffer memory also.

Yes it may be possible that due to improper conversion that hampers the quality of the video or the video file is not compatable with the player.