Larger image files are now being stored for the user avatars as part of CONFDEV-26653. This breaks some of the Confluence Questions pages where the avatar is being displayed with 256x256 dimensions (the image file size) rather than as 48x48 icons as expected (see both attachments).

By inspecting the image in the browser, the following is shown:

<span class="aui-avatar aui-avatar-big">
    <span class="aui-avatar-inner">
        <img src="...">
    </span>
</span>

Manually changing the

aui-avatar-big

class to

aui-avatar-large

(in compliance with ADG) fixes the issue and the image appears with 48x48 dimensions as expected.

It's unclear as to what the 'aui-avatar-big' class is being used for as no CSS seems to appear specifically for this.

The temporary fix from confluence-core is to override the CSS for when these avatars are being displayed, but a more permanent fix is needed.