Problem with 'Open Disc...'

[wolfbartels]

When I try to use Open Disc... I always get an 'Error'-Message

Your input can't be opened:
VLC is unable to open the MRL 'dvd://I:\'. Check the log for details.

but Open Folder... works well, chosing the I:\VIDEO_TS-Folder of the same disc.

What might be the problem and where do I find the mentioned 'log' with details ??????

Thanks, Wolf