I don't know if it's an issue with SMemo LP5 version or if it's a problem because it's on the LP6 kernel/Rom, but if you make a somewhat larger picture like one of the stock pictures with the dog or the building. It seems to have issues with force closing sometimes when you open to edit, or sometimes after you save it then try to re-open. At least that's what seems to be happening to me.
Nokia Lumia 920 - Yellow
Nokia Lumia 1020 - Black
Incredible -> Fascinate -> Thunderbolt -> HD7 -> Galaxy Note -> Samsung Focus -> Galaxy Nexus -> Galaxy S III(i777) -> Galaxy S III(i9300) -> Galaxy Note II(N7100) -> Galaxy Note II(i317)