I read your note on the FML and I had the same problem. At first I bought a litter pan that was triangular, but soon I found out that didn't work. Then I bought a rectangular pan, but that didn't work either. In a last desperate attempt I figured since I had spent the money on both litter pans I would use both of them! What I did was put the rectangular pan in first and next put the triangular pan in with the lowest of the 3 sides facing the rectangular litter pan. And it worked she has gone in her litter for going on 3 weeks! Now I don't know if this will work for you, but it shure worked for me. [Posted in FML issue 1667]