You have to use full covers not just front covers. Press the fullcover button and you get a picture like this: http://www.theotherzone.com/wii/fullcover/R9OE69.png
Great site, one problem I found, Metal Slug Anthology PAL, RMLP7U has an NTSC front cover and 3d cover although the full cover is PAL. Can this be fixed?
Thanks for your support, glad to be of service!
This isn't supported right now, it's on our TODO list....
Glad you got SMB working without a hitch also!