Lindapalm, I've read that the longer a cat doesn't use its litterbox, the harder it is to get them to use it again. Luckily in our case it had only been a matter of weeks, I think in your thread you had said that it's been months. I hope you can find a solution. Perhaps confinement with litterbox and food/water only will retrain your kitty to use the box.
Angus has had no more slip ups this week, but we're so not ready to remove tarps or open doors, he needs to prove himself for a few weeks more I think.
"One cat just leads to another." - Ernest Hemingway
Meowy Meowers - Angus n' Finn - 5 yrs old
Barky Barker - Skylar - 4 yrs old??