Make sure you have the patches that enable backup launching which you can find in the pinned thread on this forum.The patches need to be updated whenever Atmosphere is updated. Make sure you are also grabbing the latest patches from the pinned thread on this forum.
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the problem is, I already updated my sigpatches after updating my Atmosphere
and still having problems launching Disgaea 4 and Animal Crossing
Tried booting into Maintainance Mode as well and it didn't work as well
the rest of my backups open without problems though for some reason its just the 2 games I mentioned before
( and both ran without problems before I updated my CFW and Sigpatches )