My situation is a bit different and weirder. I had the green TM icon in Yosemite, but it reverted to the generic yellow when I went to El Capitan. When I do a "Get Info…" on the drive icon, the green (not yellow) icon shows in the top part of the info window. The fix mentioned above did correct things even though I was dragging "green onto green".


On a Mac since 1984.
Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.