[viagraman]

It sounds like it's a behavioral issue. If you hadn't mentioned your cat went elsewhere I would say take her to the vet asap. The same thing happened to me with my cat however, she hasn't used the litte box (#2) in a couple days. So one day I got home and could barely hold her as she seemed uncomfortable. I took her to the vet and she had an anal abcess. Luckily it wasn't worse and she heeled well after the vet drained and flushed her out. If it happens again I'd make a vet appointment or at least call and find out their opinion. Good luck.