I have created a brand account on YouTube yesterday and having all the media ready I started uploading picture and banner. Everything seemed to go smooth and after the upload was complete I noticed that the picture displays only on the channel page, but not anywhere else (including the top right corner button). I've waited a day and cleared my cashed images and that solved the problem for the upper corner, but in the comment section it is still the default "letter" avatar. Even when I add new comments.
I've tried youtube community forums but I've only managed to find a thread with 250 upvotes and no answer.