F, this forum is treacherous.
I tried to change my avatar yesterday.
I managed to read the "changes will be visible in 1-2 days" remark before uploading new picture,
but as there was literally NONE message like "uploaded successfully" nor any actual feedback after I was trying to upload different jpgs, pngs, gifs,
I assumed something is wrong.
I must confess I was really lucky that I finished this experiments with some acceptable avatar,
as I have tried to upload some... controversial pictures when I was testing and concluding "it didn't work again".
I was trying to find if ANY picture uploaded will result in ANY actual feedback message like "OK", "NOPE", "NOW WAIT".
But why should user know this, I am apparently spoiled to expect some success/fail message after file upload operation.