[KoolKat]

Aaah.
Playing a vob "solo" is fine if you just want the see the basics so to to speak & players are players as well ,all have their own way of playing.
By using the whole folder you now give the player ALL there is to know about the file as it uses the InFOrmation.

Should it continue when you play the folder correctly how it should be played,remove some codecs that do the same job.
Which is the problem one is anyones guess but if you have say 3 encoder/converter progs,4 media players and a bit more to boot ,you can now see that possibly 7+ codecs can do the job.If a player uses its own codec as well as having access to shared common codecs.......you have a fight.
I would take out some un-needed players/software and check after each one has been removed.
Careful though ,you may then lose some audio playing capabilities on other players that used "share".

Bugger i know m8.
You could remove all codecs and then install an all in one codec pack as replacement but that could end up being more of a bugger if things don't go straight.

K_K

PS: To see how easily codecs build up ,get a free program called G-Spot and put any video file into it.It will tell you how many codecs you have on your PC that can play that 1 file type.............you'll be quite shocked at how many you have.
Easy to get codec confliction if you like too much software