DVD Library Issue after VMC SP1

[mamikel]

Hi,

I have some of our favourite DVDs saved on a USB hard drive. Prior instaling some updates and SP1, there was no problem playing these from the DVD Library within VMC.

After SP1, when I try to play one of these DVDs, I get the error:

DVD Error.
Windows Media Center cannot play this DVD. Please restart windows Media Center and insert the DVD again.

If however, I copy the DVDs to a folder on the internal hard drive and point vista to this folder, the DVD plays fine. Further, I have no problem playing vidx files from the usb drive.

Can anyone suggest what might be the issue here? I wonder if it's perhaps a security issue of some form.

thanks

Matt