First of all, thank you to you who posted suggestions -- and most of all, for not judging me harshly for my aggrevation. I can see that this is not an isolated problem for cat lovers. It is just one that I've never had to deal with in all my years of kitty-loving.

I have printed out all your suggestions and plan to begin my Hercule Poirot investigation. I will use my "little grey cells" to find the culprit and then apply your great ideas.

As to your question of Feliway, I do use the spray. Never heard of the plug-in.

I will try to keep you posted as to success.

Again, thank you for your support. I'm so glad I found a place to share my cat loving ways.

Susan