Patty: I remember missing avatars recently on chrome for desktop. What may be your problem:
1 Bad internet: Your computer (or device) knows that there is a file, but can't load it due to a poor conection. Tips to fix: Put your router in a different orientation: guess n' check (if on your wifi) or either move where you are reading/posting from or upgrade your service (if on data.)
2 Trolls: Someone has their avatar as a blank screen, so it makes you rage. Tips to fix: In typical BWW fashion, yell at them, call them an 8 year old that has only seen Mamma Mia touring in Loisiana that binge watches Dance Moms with their older brother who was in the Blacklick Valley Les Mis whose mom decided that decided that they would wear berets or just calmly let them know.
3 BWW is a bit broken: If this is it, don't worry. They always fix it!
I appoligise for any spelling mistakes. I may be on my mobile. Clumsy fingers and small little touchscreen keys don't mixx. I try to spellcheck, but I may miss something.