Okay, I'm sure this ranks right up there with the least important questions ever asked, but...
I've been trying for two days to replace my 15-year-old avatar with the new, older me. I can successfully delete my old avatar, but every time I attempt to upload a new image (jpg, 75x75 pixels) my old, deleted avatar is displayed.
iMac (19,1, 3.1 GHz i5, 10.14.6, 40 Gb RAM) with Mac Pro (5,1, dual-2.4 GHz, 10.13.6, 24 Gb RAM) used as a server and to run 32-bit apps via Screen Sharing. MacBook Air (1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD) Vodafone router and Devolo Wi-Fi Extender, Canon TS8351 printer/scanner.