Subtitles on Rosemary's Baby

Hi,
I hope this question is not frequently asked, I browsed the FAQ
before, but found nothing.

I'm running ogle on an OpenBSD 3.4 machine and it works very
well for me. Yesterday I bought a "Rosemary's Baby"-DVD and ran
into a curious problem.
It seems to be impossible to switch subtitles off. Video and
Audio-Playback work good and I can switch into every
subtitle-language, but can't switch it off.
Every other DVD works perfectly.

Please tell, if you need more information or if you can give
me a hint in the right direction.

Thank you, for your time !


Thomas