Fixed in svn2636. HF
Wiki Docs:
http://wiki.team-mediaportal.com/1_MEDIAPORTAL_1/15_Customization/00_Configuration/21_DVD_Discs%2f%2f%2f%2fImages
Wiki Docs:
http://wiki.team-mediaportal.com/1_MEDIAPORTAL_1/15_Customization/00_Configuration/21_DVD_Discs%2f%2f%2f%2fImages