I recently upgraded from Yosemite to High Sierra (and wish that I hadn't ... but that's another story!) The Contacts app changed in a weird way: I have a very large number of Smart Groups. Before the upgrade they behaved exactly the way they should: They had "Contains cards which match the following conditions", and an input field for the condition, and a "+" to add more conditions. That came up when I created a group, and it came up when I edited a group. After the upgrade, two things happened: (1) Suddenly my Smart Groups had been duplicated as Distribution Lists. I never created any Distribution Lists, I don't use Distribution Lists. I now have to scroll down past a long list of Distribution Lists to get to my Smart Groups when I want to look at one of them. Only an irritation, but still ... I would like to get rid of them. And I certainly don't like Apple deciding for me that I should have them! (2) More importantly, when I try to edit a Smart Group, it still has "Contains cards which match the following conditions" ... but the criteria have all disappeared! Just a big blank square. When I create a new group, the fields for the criteria are there; I am able to specify the criteria. But once the group is created, the criteria disappear again. The groups still work properly -- all the desired cards show up. But if I discover that I need to modify them (because they find either too many names or too few names or not the right names), I can't. All I can do is delete them and create a new group -- which will itself become un-editable. Plus I can't even see what the old criteria were, to make sure that the new group isn't just exactly the same as the old one. I was online with tech support for three-and-a-half hours, trying everything, with no success. They were about to have me re-install the OS, when I decided I had already wasted enough time. Anyone else have this situation or know what to do about it? Thanks.