One more thing - pictures must be smaller than 1MB. Don't know if that's your issue. I'm just tossing out what I found when putting my avatar back on after the move to the new boards.
I'm not really tech-savvy, but, if I recall correctly, what I did was download my picture to tinypic (the site I use) and then copy the IMG code. Then I opened my Avatar window and pasted the code in the spot for it.
But, in looking at the Avatar window now, it doesn't ask for a code. When I click on the slot where it says "Choose file no file chosen" it takes me to my pictures files on my computer. Maybe they've changed how avatars are added.
Is the original photo you have smaller than 1MB? If so, maybe try clicking on "Choose file/no file chosen" and then find the picture and select it.