Thank you Jeanne! I thought it was me, but I don’t like the Fat Daddio pans either. I love my Magic Line pans. I have several removable bottom, square and round, Magic Line. I got some Fat Daddio removable bottoms earlier this year, and I sent them back. I hate the rounded corners, I didn’t like the feel, and the removable bottoms didn’t fit right, they were bowed. I baked a test cake, and sure enough, my fears were confirmed, some of the batter leaked through to the other side. The company I bought them from was very nice about it, and even contacted Fat Daddio about my dissatisfaction. Fat Daddio emailed me, offering to send me some other pans to try, and I wrote back to accept the offer. That was the last I heard from Fat Daddio, so they are not high on my list on two counts now, product and service.
I got what I wanted in Magic Line on eBay. That may be a good place to start your search.
Years back, I ordered removable bottom round pans from Ultimate Kitchen, and I see they still have some Magic Line. But they too are going the way of Fat Daddio, :( You can look on this site to see if they have what you need.