Sometime during the 3rd or 4th week of June 2020, Classic Mail stopped listing all Contacts. I must use Classic because I use NetZero Hi-Speed Dialup Internet with much faster page loads than the new Yahoo Mail. I've tested this change in Programing by Yahoo with Windows 7 32-bit and 64-bit PCs having IE11, Edge and Firefox. My Windows 10 PC has the same issue with all three Browsers. It makes no difference if I'm on Dialup or hi-speed WIFI. Please restore what you changed ASAP.