I have a 3x3x5 cuboid in the position shown (all pieces correct except for the two edges you can see. The must be a parity issue, but I can't get around it whatever I try. The only parity issue that seems possible is having a pair of middles pieces from rows 2 and 4 swapped, but I can't see how I can get a single pair to swap.
I've contacted the guy that wrote the app. He says that scrambles are formed by applying legal moves only, so there should be a solution.