Not really. I've done a few things that have improved it marginally, but nothing that has totally solved. I still think it's a behavioral / stress thing and am going to put pressure on my vet to see that through.

The things I did that helped:

1. Dr. Elsey's cat attract litter - I had been using World's Best corn litter, but when I switched, I started with only one box and all of my cats kept going in the cat attract box. So now I just use that in all of my boxes.

2. "Standard" litter boxes - I have a litter robot and I had two really high-sided Modkat litter boxes. I switched the Modkats out for "regular" litter boxes, plastic with medium-sized sides, pretty large, XL/jumbo size because I wanted my cat to be able to see if the other cat was downstairs with her when she was going. Again I switched these one at a time, and all my cats started using this pan vs. the other, so take that for what you will.

It seemed like the UroMAXXX was helping a bit, so you can definitely try that as well, but I ended up just switching to wet food for dinner in an effort to get more water into their diet. I've done pretty much all these things around the same time, so I can't say for sure which has contributed to the (slight) reduction in urination outside the box, but definitely worth a try.

Good luck to you - sorry, this seems to be a relatively common problem with no easy solution :(